RequestCaptureMediaPermission for WKWebView in Maui iOS

Question

In Microsoft Learn (https://learn.microsoft.com/en-us/answers/questions/1167987/how-to-fix-double-permission-popup-in-xamarin-ios) a solution is given to reduce the number of prompts for camera and microphone permission when WebRTC is used in Xamarin iOS. I could not get it working on Maui IOS. I have also opened a ticket in GitHub (https://github.com/dotnet/maui/issues/17431)

The API RequestMediaCapturePermission is not called at all. I am not sure where is the error in my code in the small project that I have uploaded in GitHub. Greatly appreciate any help, especially from those who managed to get it working.

Thank you.

Answer 1

From the docs: https://github.com/dotnet/maui/blob/main/src/Core/src/Handlers/WebView/WebViewHandler.cs#L32, the IWebViewHandler on iOS has been defined like below:

#elif __IOS__
            [nameof(WKUIDelegate)] = MapWKUIDelegate,
#endif

To call the RequestMediaCapturePermission, you may change the "PermissionRequest" to nameof(WKUIDelegate):

#if IOS || MACCATALYST
        Microsoft.Maui.Handlers.WebViewHandler.Mapper.Add(nameof(WKUIDelegate), (handler, view) =>
            {
                if (UIDevice.CurrentDevice.CheckSystemVersion(15, 0))
                {
                  MainThread.BeginInvokeOnMainThread(() =>
                  {
                    handler.PlatformView.UIDelegate = new WebViewUIDelegate();
                  });
                }
            });
        return builder.Build();
#endif

  [Export("webView:requestMediaCapturePermissionForOrigin:initiatedByFrame:type:decisionHandler:")]
  public override void RequestMediaCapturePermission(WKWebView webView, WKSecurityOrigin origin, WKFrameInfo frame, WKMediaCaptureType type, Action<WKPermissionDecision> decisionHandler)
 {
      decisionHandler(WKPermissionDecision.Grant);
      base.RequestMediaCapturePermission(webView, origin, frame, type, decisionHandler );
  }