PM-3349 Implemented HybridWebViewHandler for iOS

src/App/MauiProgram.cs

@@ -15,6 +15,7 @@
                 },
                 handlers =>
                 {
+                    handlers.AddHandler(typeof(Bit.App.Controls.HybridWebView), typeof(Bit.App.Handlers.HybridWebViewHandler));
 #if ANDROID
                     Bit.App.Handlers.EntryHandlerMappings.Setup();
                     Bit.App.Handlers.EditorHandlerMappings.Setup();
@@ -29,7 +30,6 @@
                     Bit.App.Handlers.ButtonHandlerMappings.Setup();
 
                     handlers.AddHandler(typeof(Bit.App.Pages.TabsPage), typeof(Bit.App.Handlers.CustomTabbedPageHandler));
-                    handlers.AddHandler(typeof(Bit.App.Controls.HybridWebView), typeof(Bit.App.Handlers.HybridWebViewHandler));
 #else
                     iOS.Core.Utilities.iOSCoreHelpers.ConfigureMAUIHandlers(handlers);
 #endif

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

@@ -25,7 +25,7 @@ namespace Bit.App.Handlers
 
         public static void MapUri(HybridWebViewHandler handler, HybridWebView view)
         {
-            if (view != null && view.Uri != null)
+            if (view != null && view?.Uri != null)
             {
                 handler?.PlatformView?.LoadUrl(view.Uri);
             }

src/App/Platforms/iOS/Handlers/HybridWebViewHandler.cs

@@ -0,0 +1,84 @@
+using System.Diagnostics.CodeAnalysis;
+using Bit.App.Controls;
+using CoreGraphics;
+using Foundation;
+using Microsoft.Maui.Handlers;
+using WebKit;
+
+namespace Bit.App.Handlers
+{
+    public partial class HybridWebViewHandler : ViewHandler<HybridWebView, WebKit.WKWebView>
+    {
+        private const string JSFunction =
+            "function invokeCSharpAction(data){window.webkit.messageHandlers.invokeAction.postMessage(data);}";
+
+        private WKUserContentController _userController;
+
+        public HybridWebViewHandler([NotNull] IPropertyMapper mapper, CommandMapper commandMapper = null) : base(mapper, commandMapper)
+        {
+        }
+
+        protected override WKWebView CreatePlatformView()
+        {
+            _userController = new WKUserContentController();
+            var script = new WKUserScript(new NSString(JSFunction), WKUserScriptInjectionTime.AtDocumentEnd, false);
+            _userController.AddUserScript(script);
+            _userController.AddScriptMessageHandler(new WebViewScriptMessageHandler(InvokeAction), "invokeAction");
+
+            var config = new WKWebViewConfiguration { UserContentController = _userController };
+            var webView = new WKWebView(CGRect.Empty, config);
+            return webView;
+        }
+
+        public static void MapUri(HybridWebViewHandler handler, HybridWebView view)
+        {
+            if (handler != null && view?.Uri != null)
+            {
+                handler?.PlatformView?.LoadRequest(new NSUrlRequest(new NSUrl(view.Uri)));
+            }
+        }
+
+        protected override void ConnectHandler(WKWebView platformView)
+        {
+            if (VirtualView?.Uri != null)
+            {
+                platformView?.LoadRequest(new NSUrlRequest(new NSUrl(VirtualView?.Uri)));
+            }
+            base.ConnectHandler(platformView);
+        }
+
+        protected override void DisconnectHandler(WKWebView platformView)
+        {
+            _userController.RemoveAllUserScripts();
+            _userController.RemoveScriptMessageHandler("invokeAction");
+            platformView?.Dispose();
+            VirtualView?.Cleanup();
+            _userController = null;
+
+            base.DisconnectHandler(platformView);
+        }
+
+        private void InvokeAction(WKScriptMessage message)
+        {
+            if(message?.Body != null)
+            {
+                VirtualView?.InvokeAction(message.Body.ToString());
+            }
+        }
+    }
+
+    public class WebViewScriptMessageHandler : NSObject, IWKScriptMessageHandler
+    {
+        private Action<WKScriptMessage> _messageReceivedAction;
+
+        public WebViewScriptMessageHandler(Action<WKScriptMessage> messageReceivedAction)
+        {
+            _messageReceivedAction = messageReceivedAction ?? throw new ArgumentNullException(nameof(messageReceivedAction));
+        }
+
+        public void DidReceiveScriptMessage(WKUserContentController userContentController, WKScriptMessage message)
+        {
+            _messageReceivedAction(message);
+        }
+    }
+}