added custom font renderers for ios dynamic text

src/iOS/Controls/CustomLabelRenderer.cs

@@ -0,0 +1,40 @@
+using System;
+using Bit.iOS.Controls;
+using UIKit;
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.iOS;
+
+[assembly: ExportRenderer(typeof(Label), typeof(CustomLabelRenderer))]
+namespace Bit.iOS.Controls
+{
+    public class CustomLabelRenderer : LabelRenderer
+    {
+        protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
+        {
+            base.OnElementChanged(e);
+
+            var view = e.NewElement as Label;
+            if(Control != null && view != null)
+            {
+                var descriptor = UIFontDescriptor.PreferredBody;
+                var pointSize = descriptor.PointSize;
+
+                var size = view.FontSize;
+                if(size == Device.GetNamedSize(NamedSize.Large, typeof(Label)))
+                {
+                    pointSize *= 1.7f;
+                }
+                else if(size == Device.GetNamedSize(NamedSize.Small, typeof(Label)))
+                {
+                    pointSize *= .8f;
+                }
+                else if(size == Device.GetNamedSize(NamedSize.Micro, typeof(Label)))
+                {
+                    pointSize *= .6f;
+                }
+
+                UIFont.FromDescriptor(descriptor, pointSize);
+            }
+        }
+    }
+}

src/iOS/Controls/ExtendedEntryRenderer.cs

@@ -21,6 +21,8 @@ namespace Bit.iOS.Controls
             var view = e.NewElement as ExtendedEntry;
             if(view != null)
             {
+                UIFont.FromDescriptor(UIFontDescriptor.PreferredBody, 1.0f);
+
                 SetBorder(view);
                 SetMaxLength(view);
                 UpdateKeyboard();

src/iOS/iOS.csproj

@@ -101,6 +101,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="Controls\ContentPageRenderer.cs" />
+    <Compile Include="Controls\CustomLabelRenderer.cs" />
     <Compile Include="Controls\ExtendedSwitchCellRenderer.cs" />
     <Compile Include="Controls\ListViewRenderer.cs" />
     <Compile Include="Controls\ExtendedViewCellRenderer.cs" />