PM-3349 PM-3350 Improved code safety with try...catch, better invoke on main thread and better null handling.

src/App/Platforms/Android/Handlers/CustomTabbedPageHandler.cs

@@ -1,5 +1,6 @@
 using AndroidX.AppCompat.View.Menu;
 using Bit.Core.Abstractions;
+using Bit.Core.Services;
 using Bit.Core.Utilities;
 using Google.Android.Material.BottomNavigation;
 using Microsoft.Maui.Handlers;
@@ -90,7 +91,17 @@ namespace Bit.App.Handlers
 			if(e.Item is MenuItemImpl item)
 			{
 				System.Diagnostics.Debug.WriteLine($"Tab '{item.Title}' was reselected so we'll PopToRoot.");
-                MainThread.BeginInvokeOnMainThread(async () => await _tabbedPage.CurrentPage.Navigation.PopToRootAsync());
+                MainThread.BeginInvokeOnMainThread(async () =>
+                {
+                    try
+                    {
+                        await _tabbedPage.CurrentPage.Navigation.PopToRootAsync();
+                    }
+                    catch (Exception ex)
+                    {
+                        LoggerHelper.LogEvenIfCantBeResolved(ex);
+                    }
+                });
 			}
         }
 

src/App/Platforms/iOS/AppDelegate.cs

@@ -15,6 +15,7 @@ using CoreNFC;
 using Foundation;
 using Microsoft.Maui.Platform;
 using UIKit;
+using UserNotifications;
 using WatchConnectivity;
 
 namespace Bit.iOS
@@ -41,73 +42,78 @@ namespace Bit.iOS
         private IStateService _stateService;
         private IEventService _eventService;
 
-        private LazyResolve<IDeepLinkContext> _deepLinkContext = new LazyResolve<IDeepLinkContext>();
+        private readonly LazyResolve<IDeepLinkContext> _deepLinkContext = new LazyResolve<IDeepLinkContext>();
 
         public override bool FinishedLaunching(UIApplication app, NSDictionary options)
         {
-            InitApp();
+            try
-
-            _deviceActionService = ServiceContainer.Resolve<IDeviceActionService>("deviceActionService");
-            _messagingService = ServiceContainer.Resolve<IMessagingService>("messagingService");
-            _broadcasterService = ServiceContainer.Resolve<IBroadcasterService>("broadcasterService");
-            _storageService = ServiceContainer.Resolve<IStorageService>("storageService");
-            _stateService = ServiceContainer.Resolve<IStateService>("stateService");
-            _eventService = ServiceContainer.Resolve<IEventService>("eventService");
-
-            ConnectToWatchIfNeededAsync().FireAndForget();
-
-            _broadcasterService.Subscribe(nameof(AppDelegate), async (message) =>
             {
-                try
+                InitApp();
+
+                _deviceActionService = ServiceContainer.Resolve<IDeviceActionService>("deviceActionService");
+                _messagingService = ServiceContainer.Resolve<IMessagingService>("messagingService");
+                _broadcasterService = ServiceContainer.Resolve<IBroadcasterService>("broadcasterService");
+                _storageService = ServiceContainer.Resolve<IStorageService>("storageService");
+                _stateService = ServiceContainer.Resolve<IStateService>("stateService");
+                _eventService = ServiceContainer.Resolve<IEventService>("eventService");
+
+                ConnectToWatchIfNeededAsync().FireAndForget();
+
+                _broadcasterService.Subscribe(nameof(AppDelegate), async (message) =>
                 {
-                    if (message.Command == "startEventTimer")
+                    try
                     {
-                        StartEventTimer();
+                        if (message.Command == "startEventTimer")
-                    }
-                    else if (message.Command == "stopEventTimer")
-                    {
-                        var task = StopEventTimerAsync();
-                    }
-                    else if (message.Command is ThemeManager.UPDATED_THEME_MESSAGE_KEY)
-                    {
-                        MainThread.BeginInvokeOnMainThread(() =>
                         {
-                            iOSCoreHelpers.AppearanceAdjustments();
+                            StartEventTimer();
-                        });
-                    }
-                    else if (message.Command == "listenYubiKeyOTP")
-                    {
-                        iOSCoreHelpers.ListenYubiKey((bool)message.Data, _deviceActionService, _nfcSession, _nfcDelegate);
-                    }
-                    else if (message.Command == "unlocked")
-                    {
-                        var needsAutofillReplacement = await _storageService.GetAsync<bool?>(
-                            Core.Constants.AutofillNeedsIdentityReplacementKey);
-                        if (needsAutofillReplacement.GetValueOrDefault())
-                        {
-                            await ASHelpers.ReplaceAllIdentities();
                         }
-                    }
+                        else if (message.Command == "stopEventTimer")
-                    else if (message.Command == "showAppExtension")
-                    {
-                        MainThread.BeginInvokeOnMainThread(() => ShowAppExtension((ExtensionPageViewModel)message.Data));
-                    }
-                    else if (message.Command == "syncCompleted")
-                    {
-                        if (message.Data is Dictionary<string, object> data && data.ContainsKey("successfully"))
                         {
-                            var success = data["successfully"] as bool?;
+                            var task = StopEventTimerAsync();
-                            if (success.GetValueOrDefault() && _deviceActionService.SystemMajorVersion() >= 12)
+                        }
+                        else if (message.Command is ThemeManager.UPDATED_THEME_MESSAGE_KEY)
+                        {
+                            await MainThread.InvokeOnMainThreadAsync(() =>
+                            {
+                                iOSCoreHelpers.AppearanceAdjustments();
+                            });
+                        }
+                        else if (message.Command == "listenYubiKeyOTP" && message.Data is bool listen)
+                        {
+                            iOSCoreHelpers.ListenYubiKey(listen, _deviceActionService, _nfcSession, _nfcDelegate);
+                        }
+                        else if (message.Command == "unlocked")
+                        {
+                            var needsAutofillReplacement = await _storageService.GetAsync<bool?>(
+                                Core.Constants.AutofillNeedsIdentityReplacementKey);
+                            if (needsAutofillReplacement.GetValueOrDefault())
                             {
                                 await ASHelpers.ReplaceAllIdentities();
                             }
                         }
-                    }
+                        else if (message.Command == "showAppExtension")
-                    else if (message.Command == "addedCipher" || message.Command == "editedCipher" ||
-                        message.Command == "restoredCipher")
-                    {
-                        if (_deviceActionService.SystemMajorVersion() >= 12)
                         {
+                            await MainThread.InvokeOnMainThreadAsync(() => ShowAppExtension((ExtensionPageViewModel)message.Data));
+                        }
+                        else if (message.Command == "syncCompleted")
+                        {
+                            if (message.Data is Dictionary<string, object> data && data.TryGetValue("successfully", out var value))
+                            {
+                                var success = value as bool?;
+                                if (success.GetValueOrDefault() && _deviceActionService.SystemMajorVersion() >= 12)
+                                {
+                                    await ASHelpers.ReplaceAllIdentities();
+                                }
+                            }
+                        }
+                        else if (message.Command == "addedCipher" || message.Command == "editedCipher" ||
+                            message.Command == "restoredCipher")
+                        {
+                            if (!UIDevice.CurrentDevice.CheckSystemVersion(12, 0))
+                            {
+                                return;
+                            }
+
                             if (await ASHelpers.IdentitiesCanIncremental())
                             {
                                 var cipherId = message.Data as string;
@@ -125,11 +131,13 @@ namespace Bit.iOS
                             }
                             await ASHelpers.ReplaceAllIdentities();
                         }
-                    }
+                        else if (message.Command == "deletedCipher" || message.Command == "softDeletedCipher")
-                    else if (message.Command == "deletedCipher" || message.Command == "softDeletedCipher")
-                    {
-                        if (_deviceActionService.SystemMajorVersion() >= 12)
                         {
+                            if (!UIDevice.CurrentDevice.CheckSystemVersion(12, 0))
+                            {
+                                return;
+                            }
+
                             if (await ASHelpers.IdentitiesCanIncremental())
                             {
                                 var identity = ASHelpers.ToCredentialIdentity(
@@ -144,101 +152,145 @@ namespace Bit.iOS
                             }
                             await ASHelpers.ReplaceAllIdentities();
                         }
-                    }
+                        else if (message.Command == "logout" && UIDevice.CurrentDevice.CheckSystemVersion(12, 0))
-                    else if (message.Command == "logout")
-                    {
-                        if (_deviceActionService.SystemMajorVersion() >= 12)
                         {
                             await ASCredentialIdentityStore.SharedStore?.RemoveAllCredentialIdentitiesAsync();
                         }
-                    }
+                        else if ((message.Command == "softDeletedCipher" || message.Command == "restoredCipher")
-                    else if ((message.Command == "softDeletedCipher" || message.Command == "restoredCipher")
+                            && UIDevice.CurrentDevice.CheckSystemVersion(12, 0))
-                        && _deviceActionService.SystemMajorVersion() >= 12)
-                    {
-                        await ASHelpers.ReplaceAllIdentities();
-                    }
-                    else if (message.Command == AppHelpers.VAULT_TIMEOUT_ACTION_CHANGED_MESSAGE_COMMAND)
-                    {
-                        var timeoutAction = await _stateService.GetVaultTimeoutActionAsync();
-                        if (timeoutAction == VaultTimeoutAction.Logout)
-                        {
-                            await ASCredentialIdentityStore.SharedStore?.RemoveAllCredentialIdentitiesAsync();
-                        }
-                        else
                         {
                             await ASHelpers.ReplaceAllIdentities();
                         }
+                        else if (message.Command == AppHelpers.VAULT_TIMEOUT_ACTION_CHANGED_MESSAGE_COMMAND)
+                        {
+                            var timeoutAction = await _stateService.GetVaultTimeoutActionAsync();
+                            if (timeoutAction == VaultTimeoutAction.Logout)
+                            {
+                                if (UIDevice.CurrentDevice.CheckSystemVersion(12, 0))
+                                {
+                                    await ASCredentialIdentityStore.SharedStore?.RemoveAllCredentialIdentitiesAsync();
+                                }
+                            }
+                            else
+                            {
+                                await ASHelpers.ReplaceAllIdentities();
+                            }
+                        }
                     }
-                }
+                    catch (Exception ex)
-                catch (Exception ex)
+                    {
-                {
+                        LoggerHelper.LogEvenIfCantBeResolved(ex);
-                    LoggerHelper.LogEvenIfCantBeResolved(ex);
+                    }
-                }
+                });
-            });
 
-            var finishedLaunching = base.FinishedLaunching(app, options);
+                var finishedLaunching = base.FinishedLaunching(app, options);
 
-            ThemeManager.SetTheme(Microsoft.Maui.Controls.Application.Current.Resources);
+                ThemeManager.SetTheme(Microsoft.Maui.Controls.Application.Current.Resources);
-            iOSCoreHelpers.AppearanceAdjustments();
+                iOSCoreHelpers.AppearanceAdjustments();
 
-            return finishedLaunching;
+                return finishedLaunching;
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+                throw;
+            }
         }
 
         public override void OnResignActivation(UIApplication uiApplication)
         {
-            if (UIApplication.SharedApplication.KeyWindow != null)
+            try
             {
-                var view = new UIView(UIApplication.SharedApplication.KeyWindow.Frame)
+                if (UIApplication.SharedApplication.KeyWindow != null)
                 {
-                    Tag = SPLASH_VIEW_TAG
+                    var view = new UIView(UIApplication.SharedApplication.KeyWindow.Frame)
-                };
+                    {
-                var backgroundView = new UIView(UIApplication.SharedApplication.KeyWindow.Frame)
+                        Tag = SPLASH_VIEW_TAG
-                {
+                    };
-                    BackgroundColor = ThemeManager.GetResourceColor("SplashBackgroundColor").ToPlatform()
+                    var backgroundView = new UIView(UIApplication.SharedApplication.KeyWindow.Frame)
-                };
+                    {
-                var logo = new UIImage(!ThemeManager.UsingLightTheme ? "logo_white.png" : "logo.png");
+                        BackgroundColor = ThemeManager.GetResourceColor("SplashBackgroundColor").ToPlatform()
-                var frame = new CGRect(0, 0, 280, 100); //Setting image width to avoid it being larger and getting cropped on smaller devices. This harcoded size should be good even for very small devices.
+                    };
-                var imageView = new UIImageView(frame)
+                    var logo = new UIImage(!ThemeManager.UsingLightTheme ? "logo_white.png" : "logo.png");
-                {
+                    var frame = new CGRect(0, 0, 280, 100); //Setting image width to avoid it being larger and getting cropped on smaller devices. This harcoded size should be good even for very small devices.
-                    Image = logo,
+                    var imageView = new UIImageView(frame)
-                    Center = new CGPoint(view.Center.X, view.Center.Y - 30),
+                    {
-                    ContentMode = UIViewContentMode.ScaleAspectFit
+                        Image = logo,
-                };
+                        Center = new CGPoint(view.Center.X, view.Center.Y - 30),
-                view.AddSubview(backgroundView);
+                        ContentMode = UIViewContentMode.ScaleAspectFit
-                view.AddSubview(imageView);
+                    };
-                UIApplication.SharedApplication.KeyWindow.AddSubview(view);
+                    view.AddSubview(backgroundView);
-                UIApplication.SharedApplication.KeyWindow.BringSubviewToFront(view);
+                    view.AddSubview(imageView);
-                UIApplication.SharedApplication.KeyWindow.EndEditing(true);
+                    UIApplication.SharedApplication.KeyWindow.AddSubview(view);
+                    UIApplication.SharedApplication.KeyWindow.BringSubviewToFront(view);
+                    UIApplication.SharedApplication.KeyWindow.EndEditing(true);
+                }
+                base.OnResignActivation(uiApplication);
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+                throw;
             }
-            base.OnResignActivation(uiApplication);
         }
 
         public override void DidEnterBackground(UIApplication uiApplication)
         {
-            if (_stateService != null && _deviceActionService != null)
+            try
             {
-                _stateService.SetLastActiveTimeAsync(_deviceActionService.GetActiveTime());
+                if (_stateService != null && _deviceActionService != null)
-            }
+                {
+                    _stateService.SetLastActiveTimeAsync(_deviceActionService.GetActiveTime());
+                }
 
-            _messagingService?.Send("slept");
+                _messagingService?.Send("slept");
-            base.DidEnterBackground(uiApplication);
+                base.DidEnterBackground(uiApplication);
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+                throw;
+            }
         }
 
-        public override void OnActivated(UIApplication uiApplication)
+        public override async void OnActivated(UIApplication uiApplication)
         {
-            base.OnActivated(uiApplication);
+            try
-            UIApplication.SharedApplication.ApplicationIconBadgeNumber = 0;
+            {
-            UIApplication.SharedApplication.KeyWindow?
+                base.OnActivated(uiApplication);
-                .ViewWithTag(SPLASH_VIEW_TAG)?
-                .RemoveFromSuperview();
 
-            ThemeManager.UpdateThemeOnPagesAsync();
+                if (UIDevice.CurrentDevice.CheckSystemVersion(17, 0))
+                {
+                    await UNUserNotificationCenter.Current.SetBadgeCountAsync(0);
+                }
+                else
+                {
+                    UIApplication.SharedApplication.ApplicationIconBadgeNumber = 0;
+                }
+
+                UIApplication.SharedApplication.KeyWindow?
+                    .ViewWithTag(SPLASH_VIEW_TAG)?
+                    .RemoveFromSuperview();
+
+                ThemeManager.UpdateThemeOnPagesAsync();
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+            }
         }
 
         public override void WillEnterForeground(UIApplication uiApplication)
         {
-            _messagingService?.Send(AppHelpers.RESUMED_MESSAGE_COMMAND);
+            try
-            base.WillEnterForeground(uiApplication);
+            {
+                _messagingService?.Send(AppHelpers.RESUMED_MESSAGE_COMMAND);
+                base.WillEnterForeground(uiApplication);
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+            }
         }
 
         [Export("application:openURL:sourceApplication:annotation:")]
@@ -249,15 +301,30 @@ namespace Bit.iOS
 
         public override bool OpenUrl(UIApplication app, NSUrl url, NSDictionary options)
         {
-            return _deepLinkContext.Value.OnNewUri(url) || base.OpenUrl(app, url, options);
+            try
+            {
+                return _deepLinkContext.Value.OnNewUri(url) || base.OpenUrl(app, url, options);
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+                return false;
+            }
         }
 
         public override bool ContinueUserActivity(UIApplication application, NSUserActivity userActivity,
             UIApplicationRestorationHandler completionHandler)
         {
-            if (Microsoft.Maui.ApplicationModel.Platform.ContinueUserActivity(application, userActivity, completionHandler))
+            try
             {
-                return true;
+                if (Microsoft.Maui.ApplicationModel.Platform.ContinueUserActivity(application, userActivity, completionHandler))
+                {
+                    return true;
+                }
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
             }
             return base.ContinueUserActivity(application, userActivity, completionHandler);
         }
@@ -265,33 +332,68 @@ namespace Bit.iOS
         [Export("application:didFailToRegisterForRemoteNotificationsWithError:")]
         public void FailedToRegisterForRemoteNotifications(UIApplication application, NSError error)
         {
-            _pushHandler?.OnErrorReceived(error);
+            try
+            {
+                _pushHandler?.OnErrorReceived(error);
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+            }
         }
 
         [Export("application:didRegisterForRemoteNotificationsWithDeviceToken:")]
         public void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
         {
-            _pushHandler?.OnRegisteredSuccess(deviceToken);
+            try
+            {
+                _pushHandler?.OnRegisteredSuccess(deviceToken);
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+            }
         }
 
         [Export("application:didRegisterUserNotificationSettings:")]
         public void DidRegisterUserNotificationSettings(UIApplication application,
             UIUserNotificationSettings notificationSettings)
         {
-            application.RegisterForRemoteNotifications();
+            try
+            {
+                application.RegisterForRemoteNotifications();
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+            }
         }
 
         [Export("application:didReceiveRemoteNotification:fetchCompletionHandler:")]
         public void DidReceiveRemoteNotification(UIApplication application, NSDictionary userInfo,
             Action<UIBackgroundFetchResult> completionHandler)
         {
-            _pushHandler?.OnMessageReceived(userInfo);
+            try
+            {
+                _pushHandler?.OnMessageReceived(userInfo);
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+            }
         }
 
         [Export("application:didReceiveRemoteNotification:")]
         public void ReceivedRemoteNotification(UIApplication application, NSDictionary userInfo)
         {
-            _pushHandler?.OnMessageReceived(userInfo);
+            try
+            {
+                _pushHandler?.OnMessageReceived(userInfo);
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+            }
         }
 
         public void InitApp()
@@ -304,17 +406,6 @@ namespace Bit.iOS
             // Migration services
             ServiceContainer.Register<INativeLogService>("nativeLogService", new ConsoleLogService());
 
-            // Note: This might cause a race condition. Investigate more.
-            //Task.Run(() =>
-            //{
-            //    FFImageLoading.Forms.Platform.CachedImageRenderer.Init();
-            //    FFImageLoading.ImageService.Instance.Initialize(new FFImageLoading.Config.Configuration
-            //    {
-            //        FadeAnimationEnabled = false,
-            //        FadeAnimationForCachedImages = false
-            //    });
-            //});
-
             iOSCoreHelpers.RegisterLocalServices();
             RegisterPush();
             var deviceActionService = ServiceContainer.Resolve<IDeviceActionService>("deviceActionService");
@@ -328,7 +419,7 @@ namespace Bit.iOS
             _nfcDelegate = new Core.NFCReaderDelegate((success, message) =>
                 _messagingService.Send("gotYubiKeyOTP", message));
 
-            iOSCoreHelpers.Bootstrap(async () => await ApplyManagedSettingsAsync());
+            iOSCoreHelpers.Bootstrap(ApplyManagedSettingsAsync);
         }
 
         private void RegisterPush()
@@ -373,31 +464,45 @@ namespace Bit.iOS
             _eventTimer = null;
             MainThread.BeginInvokeOnMainThread(() =>
             {
-                _eventTimer = NSTimer.CreateScheduledTimer(60, true, timer =>
+                try
                 {
-                    var task = Task.Run(() => _eventService.UploadEventsAsync());
+                    _eventTimer = NSTimer.CreateScheduledTimer(60, true, timer =>
-                });
+                    {
+                        _eventService?.UploadEventsAsync().FireAndForget();
+                    });
+                }
+                catch (Exception ex)
+                {
+                    LoggerHelper.LogEvenIfCantBeResolved(ex);
+                }
             });
         }
 
         private async Task StopEventTimerAsync()
         {
-            _eventTimer?.Invalidate();
+            try
-            _eventTimer?.Dispose();
-            _eventTimer = null;
-            if (_eventBackgroundTaskId > 0)
             {
+                _eventTimer?.Invalidate();
+                _eventTimer?.Dispose();
+                _eventTimer = null;
+                if (_eventBackgroundTaskId > 0)
+                {
+                    UIApplication.SharedApplication.EndBackgroundTask(_eventBackgroundTaskId);
+                    _eventBackgroundTaskId = 0;
+                }
+                _eventBackgroundTaskId = UIApplication.SharedApplication.BeginBackgroundTask(() =>
+                {
+                    UIApplication.SharedApplication.EndBackgroundTask(_eventBackgroundTaskId);
+                    _eventBackgroundTaskId = 0;
+                });
+                await _eventService.UploadEventsAsync();
                 UIApplication.SharedApplication.EndBackgroundTask(_eventBackgroundTaskId);
                 _eventBackgroundTaskId = 0;
             }
-            _eventBackgroundTaskId = UIApplication.SharedApplication.BeginBackgroundTask(() =>
+            catch (Exception ex)
             {
-                UIApplication.SharedApplication.EndBackgroundTask(_eventBackgroundTaskId);
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
-                _eventBackgroundTaskId = 0;
+            }
-            });
-            await _eventService.UploadEventsAsync();
-            UIApplication.SharedApplication.EndBackgroundTask(_eventBackgroundTaskId);
-            _eventBackgroundTaskId = 0;
         }
 
         private async Task ApplyManagedSettingsAsync()

src/Core/App.xaml.cs

@@ -81,7 +81,7 @@ namespace Bit.App
         {
             get
             {
-                return Application.Current.Windows.OfType<ResumeWindow>().FirstOrDefault(w => w.IsActive);
+                return Application.Current?.Windows.OfType<ResumeWindow>().FirstOrDefault(w => w.IsActive);
             }
         }
 
@@ -145,11 +145,14 @@ namespace Bit.App
         {
             get
             {
-                return Application.Current.MainPage;
+                return Application.Current?.MainPage;
             }
             set
             {
-                Application.Current.MainPage = value;
+                if (Application.Current != null)
+                {
+                    Application.Current.MainPage = value;
+                }
             }
         }   
 #endif

src/Core/Pages/Accounts/HomePage.xaml.cs

@@ -153,7 +153,7 @@ namespace Bit.App.Pages
 
         private async Task StartEnvironmentAsync()
         {
-             await _accountListOverlay.HideAsync();
+            await _accountListOverlay.HideAsync();
             var page = new EnvironmentPage();
             await Navigation.PushModalAsync(new NavigationPage(page));
         }

src/Core/Pages/Accounts/LockPage.xaml.cs

@@ -81,7 +81,7 @@ namespace Bit.App.Pages
                 {
                     if (message.Command == Constants.ClearSensitiveFields)
                     {
-                        MainThread.BeginInvokeOnMainThread(_vm.ResetPinPasswordFields);
+                        MainThread.BeginInvokeOnMainThread(() => _vm?.ResetPinPasswordFields());
                     }
                 });
                 if (_appeared)

src/Core/Pages/Accounts/LockPageViewModel.cs

@@ -245,9 +245,9 @@ namespace Bit.App.Pages
 
         public async Task SubmitAsync()
         {
-            ShowPassword = false;
             try
             {
+                ShowPassword = false;
                 var kdfConfig = await _stateService.GetActiveUserCustomDataAsync(a => new KdfConfig(a?.Profile));
                 if (PinEnabled)
                 {
@@ -257,12 +257,15 @@ namespace Bit.App.Pages
                 {
                     await UnlockWithMasterPasswordAsync(kdfConfig);
                 }
-
             }
             catch (LegacyUserException)
             {
                 await HandleLegacyUserAsync();
             }
+            catch (Exception ex)
+            {
+                HandleException(ex);
+            }
         }
 
         private async Task UnlockWithPinAsync(KdfConfig kdfConfig)

src/Core/Pages/Accounts/LoginPage.xaml.cs

@@ -3,6 +3,7 @@ using Bit.App.Utilities;
 using Bit.Core;
 using Bit.Core.Abstractions;
 using Bit.Core.Enums;
+using Bit.Core.Services;
 using Bit.Core.Utilities;
 
 namespace Bit.App.Pages
@@ -74,7 +75,7 @@ namespace Bit.App.Pages
             {
                 if (message.Command == Constants.ClearSensitiveFields)
                 {
-                    MainThread.BeginInvokeOnMainThread(_vm.ResetPasswordField);
+                    MainThread.BeginInvokeOnMainThread(() => _vm?.ResetPasswordField());
                 }
             });
             _mainContent.Content = _mainLayout;
@@ -188,12 +189,20 @@ namespace Bit.App.Pages
 
         private async Task LogInSuccessAsync()
         {
-            if (AppHelpers.SetAlternateMainPage(_appOptions))
+            try
             {
-                return;
+                if (AppHelpers.SetAlternateMainPage(_appOptions))
+                {
+                    return;
+                }
+                var previousPage = await AppHelpers.ClearPreviousPage();
+                App.MainPage = new TabsPage(_appOptions, previousPage);
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+                throw;
             }
-            var previousPage = await AppHelpers.ClearPreviousPage();
-            App.MainPage = new TabsPage(_appOptions, previousPage);
         }
 
         private async Task UpdateTempPasswordAsync()

src/Core/Pages/Accounts/LoginPasswordlessRequestPage.xaml.cs

@@ -1,6 +1,7 @@
 using Bit.App.Models;
 using Bit.App.Utilities;
 using Bit.Core.Enums;
+using Bit.Core.Services;
 
 namespace Bit.App.Pages
 {
@@ -48,12 +49,20 @@ namespace Bit.App.Pages
 
         private async Task LogInSuccessAsync()
         {
-            if (AppHelpers.SetAlternateMainPage(_appOptions))
+            try
             {
-                return;
+                if (AppHelpers.SetAlternateMainPage(_appOptions))
+                {
+                    return;
+                }
+                var previousPage = await AppHelpers.ClearPreviousPage();
+                App.MainPage = new TabsPage(_appOptions, previousPage);
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+                throw;
             }
-            var previousPage = await AppHelpers.ClearPreviousPage();
-            App.MainPage = new TabsPage(_appOptions, previousPage);
         }
 
         private async Task UpdateTempPasswordAsync()

src/Core/Pages/Accounts/LoginSsoPage.xaml.cs

@@ -1,6 +1,7 @@
 using Bit.App.Models;
 using Bit.App.Utilities;
 using Bit.Core.Abstractions;
+using Bit.Core.Services;
 using Bit.Core.Utilities;
 
 namespace Bit.App.Pages
@@ -89,16 +90,30 @@ namespace Bit.App.Pages
 
         private async Task StartTwoFactorAsync()
         {
-            RestoreAppOptionsFromCopy();
+            try
-            var page = new TwoFactorPage(true, _appOptions, _vm.OrgIdentifier);
+            {
-            await Navigation.PushModalAsync(new NavigationPage(page));
+                RestoreAppOptionsFromCopy();
+                var page = new TwoFactorPage(true, _appOptions, _vm.OrgIdentifier);
+                await Navigation.PushModalAsync(new NavigationPage(page));
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+            }
         }
 
         private async Task StartSetPasswordAsync()
         {
-            RestoreAppOptionsFromCopy();
+            try
-            var page = new SetPasswordPage(_appOptions, _vm.OrgIdentifier);
+            {
-            await Navigation.PushModalAsync(new NavigationPage(page));
+                RestoreAppOptionsFromCopy();
+                var page = new SetPasswordPage(_appOptions, _vm.OrgIdentifier);
+                await Navigation.PushModalAsync(new NavigationPage(page));
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+            }
         }
 
         private async Task UpdateTempPasswordAsync()
@@ -115,16 +130,23 @@ namespace Bit.App.Pages
 
         private async Task SsoAuthSuccessAsync()
         {
-            RestoreAppOptionsFromCopy();
+            try
-            await AppHelpers.ClearPreviousPage();
+            {
+                RestoreAppOptionsFromCopy();
+                await AppHelpers.ClearPreviousPage();
 
-            if (await _vaultTimeoutService.IsLockedAsync())
+                if (await _vaultTimeoutService.IsLockedAsync())
-            {
+                {
-                App.MainPage = new NavigationPage(new LockPage(_appOptions));
+                    App.MainPage = new NavigationPage(new LockPage(_appOptions));
+                }
+                else
+                {
+                    App.MainPage = new TabsPage(_appOptions, null);
+                }
             }
-            else
+            catch (Exception ex)
             {
-                App.MainPage = new TabsPage(_appOptions, null);
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
             }
         }
     }

src/Core/Pages/Accounts/SetPasswordPage.xaml.cs

@@ -1,5 +1,6 @@
 using Bit.App.Models;
 using Bit.App.Utilities;
+using Bit.Core.Services;
 
 namespace Bit.App.Pages
 {
@@ -64,12 +65,19 @@ namespace Bit.App.Pages
 
         private async Task SetPasswordSuccessAsync()
         {
-            if (AppHelpers.SetAlternateMainPage(_appOptions))
+            try
             {
-                return;
+                if (AppHelpers.SetAlternateMainPage(_appOptions))
+                {
+                    return;
+                }
+                var previousPage = await AppHelpers.ClearPreviousPage();
+                App.MainPage = new TabsPage(_appOptions, previousPage);
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
             }
-            var previousPage = await AppHelpers.ClearPreviousPage();
-            App.MainPage = new TabsPage(_appOptions, previousPage);
         }
     }
 }

src/Core/Pages/Accounts/TwoFactorPage.xaml.cs

@@ -2,6 +2,7 @@
 using Bit.App.Models;
 using Bit.App.Utilities;
 using Bit.Core.Abstractions;
+using Bit.Core.Services;
 using Bit.Core.Utilities;
 
 namespace Bit.App.Pages
@@ -63,11 +64,11 @@ namespace Bit.App.Pages
                     if (_vm.YubikeyMethod && !string.IsNullOrWhiteSpace(token) &&
                         token.Length == 44 && !token.Contains(" "))
                     {
-                        MainThread.BeginInvokeOnMainThread(async () =>
+                        MainThread.BeginInvokeOnMainThread(() =>
                         {
                             _vm.Token = token;
-                            await _vm.SubmitAsync();
                         });
+                        _vm.SubmitCommand.Execute(null);
                     }
                 }
                 else if (message.Command == "resumeYubiKey")
@@ -124,12 +125,9 @@ namespace Bit.App.Pages
             return base.OnBackButtonPressed();
         }
 
-        private async void Continue_Clicked(object sender, EventArgs e)
+        private void Continue_Clicked(object sender, EventArgs e)
         {
-            if (DoOnce())
+            _vm.SubmitCommand.Execute(null);
-            {
-                await _vm.SubmitAsync();
-            }
         }
 
         private async void Methods_Clicked(object sender, EventArgs e)
@@ -158,17 +156,24 @@ namespace Bit.App.Pages
 
         private async void TryAgain_Clicked(object sender, EventArgs e)
         {
-            if (DoOnce())
+            try
             {
-                if (_vm.Fido2Method)
+                if (DoOnce())
                 {
-                    await _vm.Fido2AuthenticateAsync();
+                    if (_vm.Fido2Method)
-                }
+                    {
-                else if (_vm.YubikeyMethod)
+                        await _vm.Fido2AuthenticateAsync();
-                {
+                    }
-                    _messagingService.Send("listenYubiKeyOTP", true);
+                    else if (_vm.YubikeyMethod)
+                    {
+                        _messagingService.Send("listenYubiKeyOTP", true);
+                    }
                 }
             }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
+            }
         }
 
         private async Task StartSetPasswordAsync()

src/Core/Pages/Accounts/TwoFactorPageViewModel.cs

@@ -1,25 +1,16 @@
-using System;
+using System.Net;
-using System.Collections.Generic;
-using System.Linq;
-using System.Net;
-using System.Threading.Tasks;
 using System.Windows.Input;
 using Bit.App.Abstractions;
-using Bit.Core.Resources.Localization;
 using Bit.App.Utilities;
 using Bit.Core.Abstractions;
 using Bit.Core.Enums;
 using Bit.Core.Exceptions;
 using Bit.Core.Models.Domain;
 using Bit.Core.Models.Request;
-using Bit.Core.Services;
+using Bit.Core.Resources.Localization;
 using Bit.Core.Utilities;
 using Newtonsoft.Json;
 
-using Microsoft.Maui.Authentication;
-using Microsoft.Maui.Controls;
-using Microsoft.Maui;
-
 namespace Bit.App.Pages
 {
     public class TwoFactorPageViewModel : CaptchaProtectedViewModel
@@ -62,7 +53,7 @@ namespace Bit.App.Pages
             _deviceTrustCryptoService = ServiceContainer.Resolve<IDeviceTrustCryptoService>();
 
             PageTitle = AppResources.TwoStepLogin;
-            SubmitCommand = new Command(async () => await SubmitAsync());
+            SubmitCommand = CreateDefaultAsyncRelayCommand(() => MainThread.InvokeOnMainThreadAsync(async () => await SubmitAsync()), allowsMultipleExecutions: false);
             MoreCommand = CreateDefaultAsyncRelayCommand(MoreAsync, onException: _logger.Exception, allowsMultipleExecutions: false);
         }
 
@@ -91,8 +82,7 @@ namespace Bit.App.Pages
 
         public bool TotpMethod => AuthenticatorMethod || EmailMethod;
 
-        public bool ShowTryAgain => (YubikeyMethod && // TODO Xamarin.Forms.Device.RuntimePlatform is no longer supported. Use Microsoft.Maui.Devices.DeviceInfo.Platform instead. For more details see https://learn.microsoft.com/en-us/dotnet/maui/migration/forms-projects#device-changes
+        public bool ShowTryAgain => (YubikeyMethod && DeviceInfo.Platform == DevicePlatform.iOS) || Fido2Method;
-Device.RuntimePlatform == Device.iOS) || Fido2Method;
 
         public bool ShowContinue
         {
@@ -106,9 +96,11 @@ Device.RuntimePlatform == Device.iOS) || Fido2Method;
             set => SetProperty(ref _enableContinue, value);
         }
 
-        public string YubikeyInstruction => // TODO Xamarin.Forms.Device.RuntimePlatform is no longer supported. Use Microsoft.Maui.Devices.DeviceInfo.Platform instead. For more details see https://learn.microsoft.com/en-us/dotnet/maui/migration/forms-projects#device-changes
+#if IOS
-Device.RuntimePlatform == Device.iOS ? AppResources.YubiKeyInstructionIos :
+        public string YubikeyInstruction => AppResources.YubiKeyInstructionIos;
-            AppResources.YubiKeyInstruction;
+#else
+        public string YubikeyInstruction => AppResources.YubiKeyInstruction;
+#endif
 
         public TwoFactorProviderType? SelectedProviderType
         {
@@ -124,7 +116,7 @@ Device.RuntimePlatform == Device.iOS ? AppResources.YubiKeyInstructionIos :
                 nameof(ShowTryAgain),
             });
         }
-        public Command SubmitCommand { get; }
+        public ICommand SubmitCommand { get; }
         public ICommand MoreCommand { get; }
         public Action TwoFactorAuthSuccessAction { get; set; }
         public Action LockAction { get; set; }
@@ -186,7 +178,7 @@ Device.RuntimePlatform == Device.iOS ? AppResources.YubiKeyInstructionIos :
                     page.DuoWebView.RegisterAction(sig =>
                     {
                         Token = sig;
-                        Device.BeginInvokeOnMainThread(async () => await SubmitAsync());
+                        SubmitCommand.Execute(null);
                     });
                     break;
                 case TwoFactorProviderType.Email:
@@ -213,68 +205,76 @@ Device.RuntimePlatform == Device.iOS ? AppResources.YubiKeyInstructionIos :
 
         public async Task Fido2AuthenticateAsync(Dictionary<string, object> providerData = null)
         {
-            await _deviceActionService.ShowLoadingAsync(AppResources.Validating);
-
-            if (providerData == null)
-            {
-                providerData = _authService.TwoFactorProvidersData[TwoFactorProviderType.Fido2WebAuthn];
-            }
-
-            var callbackUri = "bitwarden://webauthn-callback";
-            var data = AppHelpers.EncodeDataParameter(new
-            {
-                callbackUri = callbackUri,
-                data = JsonConvert.SerializeObject(providerData),
-                headerText = AppResources.Fido2Title,
-                btnText = AppResources.Fido2AuthenticateWebAuthn,
-                btnReturnText = AppResources.Fido2ReturnToApp,
-            });
-
-            var url = _webVaultUrl + "/webauthn-mobile-connector.html?" + "data=" + data +
-                      "&parent=" + Uri.EscapeDataString(callbackUri) + "&v=2";
-
-            WebAuthenticatorResult authResult = null;
             try
             {
-                var options = new WebAuthenticatorOptions
+                await _deviceActionService.ShowLoadingAsync(AppResources.Validating);
-                {
-                    Url = new Uri(url),
-                    CallbackUrl = new Uri(callbackUri),
-                    PrefersEphemeralWebBrowserSession = true,
-                };
-                authResult = await WebAuthenticator.AuthenticateAsync(options);
-            }
-            catch (TaskCanceledException)
-            {
-                // user canceled
-                await _deviceActionService.HideLoadingAsync();
-                return;
-            }
 
-            string response = null;
+                if (providerData == null)
-            if (authResult != null && authResult.Properties.TryGetValue("data", out var resultData))
-            {
-                response = Uri.UnescapeDataString(resultData);
-            }
-            if (!string.IsNullOrWhiteSpace(response))
-            {
-                Token = response;
-                await SubmitAsync(false);
-            }
-            else
-            {
-                await _deviceActionService.HideLoadingAsync();
-                if (authResult != null && authResult.Properties.TryGetValue("error", out var resultError))
                 {
-                    var message = AppResources.Fido2CheckBrowser + "\n\n" + resultError;
+                    providerData = _authService.TwoFactorProvidersData[TwoFactorProviderType.Fido2WebAuthn];
-                    await _platformUtilsService.ShowDialogAsync(message, AppResources.AnErrorHasOccurred,
+                }
-                        AppResources.Ok);
+
+                var callbackUri = "bitwarden://webauthn-callback";
+                var data = AppHelpers.EncodeDataParameter(new
+                {
+                    callbackUri = callbackUri,
+                    data = JsonConvert.SerializeObject(providerData),
+                    headerText = AppResources.Fido2Title,
+                    btnText = AppResources.Fido2AuthenticateWebAuthn,
+                    btnReturnText = AppResources.Fido2ReturnToApp,
+                });
+
+                var url = _webVaultUrl + "/webauthn-mobile-connector.html?" + "data=" + data +
+                          "&parent=" + Uri.EscapeDataString(callbackUri) + "&v=2";
+
+                WebAuthenticatorResult authResult = null;
+                try
+                {
+                    var options = new WebAuthenticatorOptions
+                    {
+                        Url = new Uri(url),
+                        CallbackUrl = new Uri(callbackUri),
+                        PrefersEphemeralWebBrowserSession = true,
+                    };
+                    authResult = await WebAuthenticator.AuthenticateAsync(options);
+                }
+                catch (TaskCanceledException)
+                {
+                    // user canceled
+                    await _deviceActionService.HideLoadingAsync();
+                    return;
+                }
+
+                string response = null;
+                if (authResult != null && authResult.Properties.TryGetValue("data", out var resultData))
+                {
+                    response = Uri.UnescapeDataString(resultData);
+                }
+                if (!string.IsNullOrWhiteSpace(response))
+                {
+                    Token = response;
+                    await SubmitAsync(false);
                 }
                 else
                 {
-                    await _platformUtilsService.ShowDialogAsync(AppResources.Fido2CheckBrowser,
+                    await _deviceActionService.HideLoadingAsync();
-                        AppResources.AnErrorHasOccurred, AppResources.Ok);
+                    if (authResult != null && authResult.Properties.TryGetValue("error", out var resultError))
+                    {
+                        var message = AppResources.Fido2CheckBrowser + "\n\n" + resultError;
+                        await _platformUtilsService.ShowDialogAsync(message, AppResources.AnErrorHasOccurred,
+                            AppResources.Ok);
+                    }
+                    else
+                    {
+                        await _platformUtilsService.ShowDialogAsync(AppResources.Fido2CheckBrowser,
+                            AppResources.AnErrorHasOccurred, AppResources.Ok);
+                    }
                 }
+
+            }
+            catch (Exception ex)
+            {
+                HandleException(ex);
             }
         }
 

src/Core/Pages/BaseContentPage.cs

@@ -170,8 +170,15 @@ namespace Bit.App.Pages
         {
             Task.Run(async () =>
             {
-                await Task.Delay(ShowModalAnimationDelay);
+                try
-                MainThread.BeginInvokeOnMainThread(() => input.Focus());
+                {
+                    await Task.Delay(ShowModalAnimationDelay);
+                    MainThread.BeginInvokeOnMainThread(() => input.Focus());
+                }
+                catch (Exception ex)
+                {
+                    _logger.Value.Exception(ex);
+                }
             });
         }
 

src/iOS.Core/Handlers/CustomTabbedHandler.cs

@@ -1,5 +1,4 @@
-using Bit.App.Abstractions;
+using Bit.App.Pages;
-using Bit.App.Pages;
 using Bit.App.Utilities;
 using Bit.Core.Abstractions;
 using Bit.Core.Utilities;
@@ -13,7 +12,7 @@ namespace Bit.iOS.Core.Handlers
     public partial class CustomTabbedHandler : TabbedRenderer
     {
         private IBroadcasterService _broadcasterService;
-        private UITabBarItem _previousSelectedItem;
+        private UITabBarItem? _previousSelectedItem;
 
         public CustomTabbedHandler()
         {
@@ -73,8 +72,7 @@ namespace Bit.iOS.Core.Handlers
         private void UpdateTabBarAppearance()
         {
             // https://developer.apple.com/forums/thread/682420
-            var deviceActionService = ServiceContainer.Resolve<IDeviceActionService>("deviceActionService");
+            if (UIDevice.CurrentDevice.CheckSystemVersion(15,0))
-            if (deviceActionService.SystemMajorVersion() >= 15)
             {
                 var appearance = new UITabBarAppearance();
                 appearance.ConfigureWithOpaqueBackground();

src/iOS.Core/Services/LocalizeService.cs

@@ -1,5 +1,4 @@
-using System;
+using System.Diagnostics;
-using System.Diagnostics;
 using System.Globalization;
 using Bit.App.Abstractions;
 using Bit.App.Models;
@@ -20,7 +19,7 @@ namespace Bit.iOS.Core.Services
             }
 
             // This gets called a lot - try/catch can be expensive so consider caching or something
-            CultureInfo ci = null;
+            CultureInfo? ci;
             try
             {
                 ci = new CultureInfo(netLanguage);
@@ -108,7 +107,7 @@ namespace Bit.iOS.Core.Services
             {
                 df.Locale = NSLocale.CurrentLocale;
                 df.DateStyle = NSDateFormatterStyle.Short;
-                return df.StringFor((NSDate)date);
+                return df.StringFor((NSDate?)date);
             }
         }
 
@@ -118,7 +117,7 @@ namespace Bit.iOS.Core.Services
             {
                 df.Locale = NSLocale.CurrentLocale;
                 df.TimeStyle = NSDateFormatterStyle.Short;
-                return df.StringFor((NSDate)time);
+                return df.StringFor((NSDate?)time);
             }
         }
     }

src/iOS.Core/Utilities/DictionaryExtensions.cs

@@ -1,8 +1,4 @@
-using System;
+using Foundation;
-using System.Collections.Generic;
-using System.Linq;
-using Bit.Core.Models.Domain;
-using Foundation;
 using Newtonsoft.Json;
 
 namespace Bit.iOS.Core.Utilities
@@ -15,6 +11,7 @@ namespace Bit.iOS.Core.Utilities
         }
 
         public static NSDictionary<KTo,VTo> ToNSDictionary<KFrom,VFrom,KTo,VTo>(this Dictionary<KFrom, VFrom> dict, Func<KFrom, KTo> keyConverter, Func<VFrom, VTo> valueConverter)
+            where KFrom : notnull
             where KTo : NSObject
             where VTo : NSObject
         {
@@ -23,19 +20,20 @@ namespace Bit.iOS.Core.Utilities
             return NSDictionary<KTo, VTo>.FromObjectsAndKeys(NSValues, NSKeys, NSKeys.Count());
         }
 
-        public static Dictionary<string, object> ToDictionary(this NSDictionary<NSString, NSObject> nsDict)
+        public static Dictionary<string, object?> ToDictionary(this NSDictionary<NSString, NSObject> nsDict)
         {
-            return nsDict.ToDictionary(v => v?.ToString() as object);
+            return nsDict.ToDictionary(v => v?.ToString());
         }
 
-        public static Dictionary<string, object> ToDictionary(this NSDictionary<NSString, NSObject> nsDict, Func<NSObject, object> valueTransformer)
+        public static Dictionary<string, object?> ToDictionary(this NSDictionary<NSString, NSObject> nsDict, Func<NSObject, object?> valueTransformer)
         {
             return nsDict.ToDictionary(k => k.ToString(), v => valueTransformer(v));
         }
 
-        public static Dictionary<KTo, VTo> ToDictionary<KFrom, VFrom, KTo, VTo>(this NSDictionary<KFrom, VFrom> nsDict, Func<KFrom, KTo> keyConverter, Func<VFrom, VTo> valueConverter)
+        public static Dictionary<KTo, VTo?> ToDictionary<KFrom, VFrom, KTo, VTo>(this NSDictionary<KFrom, VFrom> nsDict, Func<KFrom, KTo> keyConverter, Func<VFrom, VTo?> valueConverter)
             where KFrom : NSObject
             where VFrom : NSObject
+            where KTo : notnull
         {
             var keys = nsDict.Keys.Select(k => keyConverter(k)).ToArray();
             var values = nsDict.Values.Select(v => valueConverter(v)).ToArray();

src/iOS.Core/Utilities/WCSessionManager.cs

@@ -1,14 +1,8 @@
-using System;
+using System.Diagnostics;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Linq;
-using System.Threading.Tasks;
-using Bit.Core.Models.Domain;
 using Bit.Core.Services;
 using Bit.iOS.Core.Utilities;
 using Foundation;
 using Newtonsoft.Json;
-using ObjCRuntime;
 
 namespace WatchConnectivity
 {
@@ -17,35 +11,45 @@ namespace WatchConnectivity
         // Setup is converted from https://www.natashatherobot.com/watchconnectivity-say-hello-to-wcsession/ 
         // with some extra bits
         private static readonly WCSessionManager sharedManager = new WCSessionManager();
-        private static WCSession session = WCSession.IsSupported ? WCSession.DefaultSession : null;
+        private static WCSession? session = WCSession.IsSupported ? WCSession.DefaultSession : null;
 
-        public event WCSessionReceiveDataHandler OnApplicationContextUpdated;
+        public event WCSessionReceiveDataHandler? OnApplicationContextUpdated;
-        public event WCSessionReceiveDataHandler OnMessagedReceived;
+        public event WCSessionReceiveDataHandler? OnMessagedReceived;
-        public delegate void WCSessionReceiveDataHandler(WCSession session, Dictionary<string, object> data);
+        public delegate void WCSessionReceiveDataHandler(WCSession session, Dictionary<string, object?> data);
 
-        WCSessionUserInfoTransfer _transf;
+        WCSessionUserInfoTransfer? _transf;
 
-        private WCSession validSession
+        private WCSession? validSession
         {
             get
             {
+                if (session is null)
+                {
+                    return null;
+                }
+
                 Debug.WriteLine($"Paired status:{(session.Paired ? '✓' : '✗')}\n");
                 Debug.WriteLine($"Watch App Installed status:{(session.WatchAppInstalled ? '✓' : '✗')}\n");
                 return (session.Paired && session.WatchAppInstalled) ? session : null;
             }
         }
 
-        private WCSession validReachableSession
+        private WCSession? validReachableSession
         {
             get
             {
+                if (session is null)
+                {
+                    return null;
+                }
+
                 return session.Reachable ? validSession : null;
             }
         }
 
         public bool IsValidSession => validSession != null;
 
-        public bool IsSessionReachable => session.Reachable;
+        public bool IsSessionReachable => session?.Reachable ?? false;
 
         public bool IsSessionActivated => validSession?.ActivationState == WCSessionActivationState.Activated;
 
@@ -71,7 +75,7 @@ namespace WatchConnectivity
 
         public override void SessionReachabilityDidChange(WCSession session)
         {
-            Debug.WriteLine($"Watch connectivity Reachable:{(session.Reachable ? '✓' : '✗')}");
+            Debug.WriteLine($"Watch connectivity Reachable:{(session?.Reachable == true ? '✓' : '✗')}");
         }
 
         public void SendBackgroundHighPriorityMessage(NSDictionary<NSString, NSObject> applicationContext)
@@ -102,7 +106,7 @@ namespace WatchConnectivity
 
         public void SendBackgroundFifoHighPriorityMessage(Dictionary<string, object> message)
         {
-            if(validSession is null || validSession.ActivationState != WCSessionActivationState.Activated)
+            if (session is null || validSession is null || validSession.ActivationState != WCSessionActivationState.Activated)
             {
                 return;
             }
@@ -112,6 +116,10 @@ namespace WatchConnectivity
             Debug.WriteLine("Started transferring user info");
 
             _transf = session.TransferUserInfo(message.ToNSDictionary());
+            if (_transf is null)
+            {
+                return;
+            }
 
             Task.Run(async () =>
             {
@@ -136,7 +144,7 @@ namespace WatchConnectivity
             if (OnApplicationContextUpdated != null)
             {
                 var keys = applicationContext.Keys.Select(k => k.ToString()).ToArray();
-                var values = applicationContext.Values.Select(v => JsonConvert.DeserializeObject(v.ToString())).ToArray();
+                var values = applicationContext.Values.Select(v => v != null ? JsonConvert.DeserializeObject(v.ToString()) : null).ToArray();
                 var dictionary = keys.Zip(values, (k, v) => new { Key = k, Value = v })
                                      .ToDictionary(x => x.Key, x => x.Value);
 

src/iOS.Core/Utilities/iOSCoreHelpers.cs

@@ -116,8 +116,12 @@ namespace Bit.iOS.Core.Utilities
                 ServiceContainer.Register<INativeLogService>("nativeLogService", new ConsoleLogService());
             }
 
-            ILogger logger = null;
+            ILogger? logger = null;
-            if (ServiceContainer.Resolve<ILogger>("logger", true) == null)
+            if (ServiceContainer.TryResolve<ILogger>(out var resolvedLogger))
+            {
+                logger = resolvedLogger;
+            }
+            else
             { 
 #if DEBUG
                 logger = DebugLogger.Instance;
@@ -129,6 +133,12 @@ namespace Bit.iOS.Core.Utilities
 
             var preferencesStorage = new PreferencesStorageService(AppGroupId);
             var appGroupContainer = new NSFileManager().GetContainerUrl(AppGroupId);
+            if (appGroupContainer?.Path is null)
+            {
+                var nreAppGroupContainer = new NullReferenceException("appGroupContainer or its Path is null when registering local services");
+                logger!.Exception(nreAppGroupContainer);
+                throw nreAppGroupContainer;
+            }
             var liteDbStorage = new LiteDbStorageService(
                 Path.Combine(appGroupContainer.Path, "Library", "bitwarden.db"));
             var localizeService = new LocalizeService();
@@ -187,14 +197,14 @@ namespace Bit.iOS.Core.Utilities
                 ServiceContainer.Resolve<ILogger>()));
         }
 
-        public static void Bootstrap(Func<Task> postBootstrapFunc = null)
+        public static void Bootstrap(Func<Task>? postBootstrapFunc = null)
         {
             var locale = ServiceContainer.Resolve<IStateService>().GetLocale();
             (ServiceContainer.Resolve<II18nService>("i18nService") as MobileI18nService)
-                .Init(locale != null ? new System.Globalization.CultureInfo(locale) : null);
+                ?.Init(locale != null ? new System.Globalization.CultureInfo(locale) : null);
             ServiceContainer.Resolve<IAuthService>("authService").Init();
             (ServiceContainer.
-                Resolve<IPlatformUtilsService>("platformUtilsService") as MobilePlatformUtilsService).Init();
+                Resolve<IPlatformUtilsService>("platformUtilsService") as MobilePlatformUtilsService)?.Init();
 
             var accountsManager = new AccountsManager(
                 ServiceContainer.Resolve<IBroadcasterService>("broadcasterService"),
@@ -231,20 +241,31 @@ namespace Bit.iOS.Core.Utilities
                 if (message.Command == "showDialog")
                 {
                     var details = message.Data as DialogDetails;
+                    if (details is null)
+                    {
+                        return;
+                    }
                     var confirmText = string.IsNullOrWhiteSpace(details.ConfirmText) ?
                         AppResources.Ok : details.ConfirmText;
 
                     NSRunLoop.Main.BeginInvokeOnMainThread(async () =>
                     {
-                        var result = await deviceActionService.DisplayAlertAsync(details.Title, details.Text,
+                        try
-                           details.CancelText, confirmText);
+                        {
-                        var confirmed = result == details.ConfirmText;
+                            var result = await deviceActionService.DisplayAlertAsync(details.Title, details.Text,
-                        messagingService.Send("showDialogResolve", new Tuple<int, bool>(details.DialogId, confirmed));
+                               details.CancelText, confirmText);
+                            var confirmed = result == details.ConfirmText;
+                            messagingService.Send("showDialogResolve", new Tuple<int, bool>(details.DialogId, confirmed));
+                        }
+                        catch (Exception ex)
+                        {
+                            LoggerHelper.LogEvenIfCantBeResolved(ex);
+                        }
                     });
                 }
-                else if (message.Command == "listenYubiKeyOTP")
+                else if (message.Command == "listenYubiKeyOTP" && message.Data is bool listen)
                 {
-                    ListenYubiKey((bool)message.Data, deviceActionService, nfcSession, nfcDelegate);
+                    ListenYubiKey(listen, deviceActionService, nfcSession, nfcDelegate);
                 }
             });
         }
@@ -268,29 +289,36 @@ namespace Bit.iOS.Core.Utilities
             }
         }
 
-        private static async Task BootstrapAsync(Func<Task> postBootstrapFunc = null)
+        private static async Task BootstrapAsync(Func<Task>? postBootstrapFunc = null)
         {
-            await ServiceContainer.Resolve<IEnvironmentService>("environmentService").SetUrlsFromStorageAsync();
+            try
-
-            InitializeAppSetup();
-            // TODO: Update when https://github.com/bitwarden/mobile/pull/1662 gets merged
-            var deleteAccountActionFlowExecutioner = new DeleteAccountActionFlowExecutioner(
-                ServiceContainer.Resolve<IApiService>("apiService"),
-                ServiceContainer.Resolve<IMessagingService>("messagingService"),
-                ServiceContainer.Resolve<IPlatformUtilsService>("platformUtilsService"),
-                ServiceContainer.Resolve<IDeviceActionService>("deviceActionService"),
-                ServiceContainer.Resolve<ILogger>("logger"));
-            ServiceContainer.Register<IDeleteAccountActionFlowExecutioner>("deleteAccountActionFlowExecutioner", deleteAccountActionFlowExecutioner);
-
-            var verificationActionsFlowHelper = new VerificationActionsFlowHelper(
-                ServiceContainer.Resolve<IPasswordRepromptService>("passwordRepromptService"),
-                ServiceContainer.Resolve<ICryptoService>("cryptoService"),
-                ServiceContainer.Resolve<IUserVerificationService>());
-            ServiceContainer.Register<IVerificationActionsFlowHelper>("verificationActionsFlowHelper", verificationActionsFlowHelper);
-
-            if (postBootstrapFunc != null)
             {
-                await postBootstrapFunc.Invoke();
+                await ServiceContainer.Resolve<IEnvironmentService>("environmentService").SetUrlsFromStorageAsync();
+
+                InitializeAppSetup();
+                // TODO: Update when https://github.com/bitwarden/mobile/pull/1662 gets merged
+                var deleteAccountActionFlowExecutioner = new DeleteAccountActionFlowExecutioner(
+                    ServiceContainer.Resolve<IApiService>("apiService"),
+                    ServiceContainer.Resolve<IMessagingService>("messagingService"),
+                    ServiceContainer.Resolve<IPlatformUtilsService>("platformUtilsService"),
+                    ServiceContainer.Resolve<IDeviceActionService>("deviceActionService"),
+                    ServiceContainer.Resolve<ILogger>("logger"));
+                ServiceContainer.Register<IDeleteAccountActionFlowExecutioner>("deleteAccountActionFlowExecutioner", deleteAccountActionFlowExecutioner);
+
+                var verificationActionsFlowHelper = new VerificationActionsFlowHelper(
+                    ServiceContainer.Resolve<IPasswordRepromptService>("passwordRepromptService"),
+                    ServiceContainer.Resolve<ICryptoService>("cryptoService"),
+                    ServiceContainer.Resolve<IUserVerificationService>());
+                ServiceContainer.Register<IVerificationActionsFlowHelper>("verificationActionsFlowHelper", verificationActionsFlowHelper);
+
+                if (postBootstrapFunc != null)
+                {
+                    await postBootstrapFunc.Invoke();
+                }
+            }
+            catch (Exception ex)
+            {
+                LoggerHelper.LogEvenIfCantBeResolved(ex);
             }
         }
 

src/iOS.Core/Views/ExtensionSearchDelegate.cs

@@ -1,6 +1,4 @@
-using System;
+using Bit.Core.Services;
-using System.Threading;
-using System.Threading.Tasks;
 using Foundation;
 using UIKit;
 
@@ -9,7 +7,7 @@ namespace Bit.iOS.Core.Views
     public class ExtensionSearchDelegate : UISearchBarDelegate
     {
         private readonly UITableView _tableView;
-        private CancellationTokenSource _filterResultsCancellationTokenSource;
+        private CancellationTokenSource? _filterResultsCancellationTokenSource;
 
         public ExtensionSearchDelegate(UITableView tableView)
         {
@@ -23,25 +21,34 @@ namespace Bit.iOS.Core.Views
             {
                 NSRunLoop.Main.BeginInvokeOnMainThread(async () =>
                 {
-                    if (!string.IsNullOrWhiteSpace(searchText))
-                    {
-                        await Task.Delay(300);
-                        if (searchText != searchBar.Text)
-                        {
-                            return;
-                        }
-                        else
-                        {
-                            _filterResultsCancellationTokenSource?.Cancel();
-                        }
-                    }
                     try
                     {
-                        ((ExtensionTableSource)_tableView.Source).FilterResults(searchText, cts.Token);
+                        if (!string.IsNullOrWhiteSpace(searchText))
-                        _tableView.ReloadData();
+                        {
+                            await Task.Delay(300);
+                            if (searchText != searchBar.Text)
+                            {
+                                return;
+                            }
+                            else
+                            {
+                                _filterResultsCancellationTokenSource?.Cancel();
+                            }
+                        }
+                        try
+                        {
+                            ((ExtensionTableSource)_tableView.Source).FilterResults(searchText, cts.Token);
+                            _tableView.ReloadData();
+                        }
+                        catch (OperationCanceledException) { }
+                        _filterResultsCancellationTokenSource = cts;
+                    }
+                    catch (Exception ex)
+                    {
+                        LoggerHelper.LogEvenIfCantBeResolved(ex);
+                        _filterResultsCancellationTokenSource?.Cancel();
+                        cts?.Cancel();
                     }
-                    catch (OperationCanceledException) { }
-                    _filterResultsCancellationTokenSource = cts;
                 });
             }, cts.Token);
         }

src/iOS.Extension/LoadingViewController.cs

@@ -479,16 +479,23 @@ namespace Bit.iOS.Extension
         {
             NSRunLoop.Main.BeginInvokeOnMainThread(async () =>
             {
-                if (await IsAuthed())
+                try
                 {
-                    var stateService = ServiceContainer.Resolve<IStateService>("stateService");
+                    if (await IsAuthed())
-                    await AppHelpers.LogOutAsync(await stateService.GetActiveUserIdAsync());
-                    var deviceActionService = ServiceContainer.Resolve<IDeviceActionService>("deviceActionService");
-                    if (deviceActionService.SystemMajorVersion() >= 12)
                     {
-                        await ASCredentialIdentityStore.SharedStore?.RemoveAllCredentialIdentitiesAsync();
+                        var stateService = ServiceContainer.Resolve<IStateService>("stateService");
+                        await AppHelpers.LogOutAsync(await stateService.GetActiveUserIdAsync());
+                        if (UIDevice.CurrentDevice.CheckSystemVersion(12, 0))
+                        {
+                            await ASCredentialIdentityStore.SharedStore?.RemoveAllCredentialIdentitiesAsync();
+                        }
                     }
                 }
+                catch (Exception ex)
+                {
+                    LoggerHelper.LogEvenIfCantBeResolved(ex);
+                    throw;
+                }
             });
         }
 

src/iOS.ShareExtension/LoadingViewController.cs

@@ -274,14 +274,22 @@ namespace Bit.iOS.ShareExtension
         {
             NSRunLoop.Main.BeginInvokeOnMainThread(async () =>
             {
-                if (await IsAuthed())
+                try
                 {
-                    await AppHelpers.LogOutAsync(await _stateService.Value.GetActiveUserIdAsync());
+                    if (await IsAuthed())
-                    if (UIDevice.CurrentDevice.CheckSystemVersion(12, 0))
                     {
-                        await ASCredentialIdentityStore.SharedStore?.RemoveAllCredentialIdentitiesAsync();
+                        await AppHelpers.LogOutAsync(await _stateService.Value.GetActiveUserIdAsync());
+                        if (UIDevice.CurrentDevice.CheckSystemVersion(12, 0))
+                        {
+                            await ASCredentialIdentityStore.SharedStore?.RemoveAllCredentialIdentitiesAsync();
+                        }
                     }
                 }
+                catch (Exception ex)
+                {
+                    LoggerHelper.LogEvenIfCantBeResolved(ex);
+                    throw;
+                }
             });
         }