How to override native control methods with maui handler pattern

[v-croft]

Hi @davidortinau.

I need to intercept the press and release events for controls in maui and this is a really helpful example.

I tried to implement the example within the context of our app but got a cast exception (the sample worked when run on its own).

As a better solution I tried to migrate the code to the maui handler pattern or directly within the control using HandlerChanged event. It is possible to make this work for Android as the Android.Views.View.Touch event is accessible via the PlatformView and for Windows via the PointerPressed and PointerReleased events. However, I cannot see how to override the UIView.TouchesBegan and UIView.TouchesCancelled methods for iOS using the handler pattern or directly (as you do with the Renderer).

public class PressableView : ContentView
{
    public PressableView ()
    {
        HandlerChanged += OnHandlerChanged;
    }

    void OnHandlerChanged(object sender, EventArgs e)
    {
        ContentView view = sender as ContentView;
#if ANDROID
        (view.Handler.PlatformView as Android.Views.View).Touch += Control_Touch;
#elif IOS || MACCATALYST
        // ?????
#elif WINDOWS
        (view.Handler.PlatformView as Microsoft.UI.Xaml.UIElement).PointerPressed += RaisePressed;
        (view.Handler.PlatformView as Microsoft.UI.Xaml.UIElement).PointerReleased += RaiseReleased;
#endif
    }


    //...
}

Am I missing something or is this a gap in the maui handler pattern?

I would really appreciate some help to point me in the right direction (I do not find any examples online) that address this.