Receiving Multi Touch Events with overlaying ViewController

iOS
1

Hi,

I have a MG-App combined with Xamarin.Forms for the Layout.
Everything works fine, expect from multi touch events.
The TouchPanel didn’t receive the second or third finger.

Need some help to solve that problem.
Regards
Ronny

` var pianoApp = new App();
LoadApplication(pianoApp);

        var result = base.FinishedLaunching(app, options);

        var formsVC = UIApplication.SharedApplication.KeyWindow.RootViewController;
        formsVC.View.BackgroundColor = UIColor.Clear;
        formsVC.View.Opaque = false;

        var audioEngine = DependencyService.Get<IAudioEngine>();

        var game = new PianoGame(audioEngine);
        game.Run();

        var gameVC = UIApplication.SharedApplication.KeyWindow.RootViewController;

        formsVC.View.RemoveFromSuperview();
        formsVC.RemoveFromParentViewController();

        gameVC.View.Opaque                  = false;
        gameVC.View.MultipleTouchEnabled    = true;
        gameVC.View.UserInteractionEnabled  = true;
        gameVC.View.ExclusiveTouch          = false;

        gameVC.RemoveFromParentViewController();
        gameVC.View.RemoveFromSuperview();

        var vc = new MyViewController();
        vc.View.ExclusiveTouch = false;
        vc.View.MultipleTouchEnabled = true;
        vc.View.UserInteractionEnabled = true;
        UIApplication.SharedApplication.KeyWindow.RootViewController = vc;

        gameVC.WillMoveToParentViewController(vc);
        vc.View.AddSubview(gameVC.View);
        vc.AddChildViewController(gameVC);
        gameVC.DidMoveToParentViewController(vc);

        vc.View.BackgroundColor = UIColor.Clear;
        vc.View.Frame = gameVC.View.Frame;
        
        formsVC.WillMoveToParentViewController(vc);
        vc.View.AddSubview(formsVC.View);
        vc.AddChildViewController(formsVC);
        formsVC.DidMoveToParentViewController(vc);

        formsVC.View.Opaque                 = true;
        formsVC.View.BackgroundColor        = UIColor.Clear;
        formsVC.View.MultipleTouchEnabled   = true;
        formsVC.View.UserInteractionEnabled = true;
        formsVC.View.ExclusiveTouch         = false;

        vc.GameViewController = gameVC;
        vc.FormsViewController = formsVC;

        return result;`
2

Just solved it by myself.
I need to ensure that every view from the overlaying view controller has the property MultipleTouchEnabled set to true. It didn’t reach out to enable only the root view controller.
Just wrote some helper method and called it from FinishedLoading(…).

Kind regards
Ronny

	private void EnableMultiTouch(UIView view) {
		view.MultipleTouchEnabled = true;
		foreach (var subView in view.Subviews) {
			EnableMultiTouch(subView);
		}
	}