hybrid web view and duo html/js

src/iOS/Controls/HybridWebViewRenderer.cs

@@ -0,0 +1,54 @@
+using System.IO;
+using Foundation;
+using WebKit;
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.iOS;
+using Bit.App.Controls;
+using Bit.iOS.Controls;
+
+[assembly: ExportRenderer(typeof(HybridWebView), typeof(HybridWebViewRenderer))]
+namespace Bit.iOS.Controls
+{
+    public class HybridWebViewRenderer : ViewRenderer<HybridWebView, WKWebView>, IWKScriptMessageHandler
+    {
+        private const string JSFunction =
+            "function invokeCSharpAction(data){window.webkit.messageHandlers.invokeAction.postMessage(data);}";
+
+        private WKUserContentController _userController;
+
+        protected override void OnElementChanged(ElementChangedEventArgs<HybridWebView> e)
+        {
+            base.OnElementChanged(e);
+
+            if(Control == null)
+            {
+                _userController = new WKUserContentController();
+                var script = new WKUserScript(new NSString(JSFunction), WKUserScriptInjectionTime.AtDocumentEnd, false);
+                _userController.AddUserScript(script);
+                _userController.AddScriptMessageHandler(this, "invokeAction");
+
+                var config = new WKWebViewConfiguration { UserContentController = _userController };
+                var webView = new WKWebView(Frame, config);
+                SetNativeControl(webView);
+            }
+
+            if(e.OldElement != null)
+            {
+                _userController.RemoveAllUserScripts();
+                _userController.RemoveScriptMessageHandler("invokeAction");
+                var hybridWebView = e.OldElement as HybridWebView;
+                hybridWebView.Cleanup();
+            }
+
+            if(e.NewElement != null)
+            {
+                Control.LoadRequest(new NSUrlRequest(new NSUrl(Element.Uri, false)));
+            }
+        }
+
+        public void DidReceiveScriptMessage(WKUserContentController userContentController, WKScriptMessage message)
+        {
+            Element.InvokeAction(message.Body.ToString());
+        }
+    }
+}

src/iOS/iOS.csproj

@@ -217,6 +217,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="Controls\ContentPageRenderer.cs" />
+    <Compile Include="Controls\HybridWebViewRenderer.cs" />
     <Compile Include="Controls\ExtendedButtonRenderer.cs" />
     <Compile Include="Controls\CustomButtonRenderer.cs" />
     <Compile Include="Controls\CustomLabelRenderer.cs" />