Xamarin.iOS:TouchEvent cannot been called in UIScrollView

Question

I need to add TouchEvent into a UIScrollView but it seems the method TouchesBegan will never been called when I touch the ScrollView.I find a solution from here.And I have to add a singleTapGesture .However,I can't do that for some reason.Is it the only solution？

Answer 1

You can add a gesture recognizer on any view, doing this:

myView.AddGestureRecognizer(new UITapGestureRecognizer(() =>
{
  //Do Something
}));

Answer 2

You can customize a subclass that inherits from UIScrollView.And override the method TouchesBegan TouchesBegan and TouchesMoved

public class MyScrollerView: UIScrollView
{
    public MyScrollerView()
    {

    }
    public override void TouchesBegan(NSSet touches, UIEvent evt)
    {
        this.NextResponder.TouchesBegan(touches, evt);
    }

    public override void TouchesMoved(NSSet touches, UIEvent evt)
    {
        this.NextResponder.TouchesMoved(touches, evt);
    }

    public override void TouchesEnded(NSSet touches, UIEvent evt)
    {
        this.NextResponder.TouchesEnded(touches, evt);
    }

} 

in xxx.cs

var myScrollView = new MyScrollerView();
myScrollView.UserInteractionEnabled = true;
myScrollView.DelaysContentTouches = false; // it is important
//. . .

And now you can call the method TouchesBegan TouchesBegan and TouchesMoved in the ViewController

public override void TouchesBegan(NSSet touches, UIEvent evt)
{
     // do some you want
}