Xamarin UITextView Binding in Code

Question

We are developping a xamarin forms app in VS2019 where we require the rtf funcionality of the native UITextView. We implemented this with an interface and a platform implementation as shown below - which works fine. What we are missing is how to bind this view to the viewmodel - as the view is added to the view in code. Would appreciate some advice.

UITextView textView = new UITextView {AllowsEditingTextAttributes = true};
var rtfstring = new NSAttributedString(rtfstring, new NSAttributedStringDocumentAttributes { DocumentType = NSDocumentType.RTF }, ref error);

textView.AttributedText = rtfstring;
stackLayout.Children.Add(textView);

Answer 1

Hello,

Welcome to Microsoft Q&A!

We could use Custom Renderer .

in Forms

Create a custom Editor

   public class MyEditor:Editor  
   {  
     
   }  

in iOS project

   using Foundation;  
     
   using UIKit;  
     
   using Xamarin.Forms;  
   using Xamarin.Forms.Platform.iOS;  
     
   using xxx;  
   using xxx.iOS;  
     
   [assembly:ExportRenderer(typeof(MyEditor),typeof(MyTextViewRenderer))]  
   namespace xxx.iOS  
   {  
       public class MyTextViewRenderer:EditorRenderer  
       {  
     
           protected override void OnElementChanged(ElementChangedEventArgs<Editor> e)  
           {  
               base.OnElementChanged(e);  
     
               if(Control!=null)  
               {  
                   UITextView textView = new UITextView { AllowsEditingTextAttributes = true };  
                   var rtfstring = new NSAttributedString(rtfstring, new NSAttributedStringDocumentAttributes { DocumentType = NSDocumentType.RTF }, ref error);  
     
                   textView.AttributedText = rtfstring;  
     
                   SetNativeControl(textView);  
               }  
     
           }  
     
       }  
   }  

in ContentPage

   var rtfTextView = new MyEditor();  
   stackLayout.Children.Add(rtfTextView);  

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