UITapGestureRecognizer on UIAlertController is not firing - ios

Question

I am trying to attach a UITapGestureRecognizer to the View of a UIAlertController but the recognize event is never firing.
I am coding this in Xamarin, but I feel like the issue applies to native code as well.
InvokeOnMainThread(() =>
var alert = new UIAlertController();
alert.Title = "My Title";
alert.Message = "My Message";
UITapGestureRecognizer tapGestureRecognizer = new
UITapGestureRecognizer((gesture) =>
{
//I never get here
});
alert.View.AddGestureRecognizer(tapGestureRecognizer);
alert.View.UserInteractionEnabled = true;
this.PresentViewController(alert, true, null);
});
Ideally, I would like to dismiss the alert when a user touches the popup, but I can't seem to detect the gesture.
I've tried adding the recognizer both, before, and after the alert is presented.

Answer 1

Solution:
To dismiss the UIAlertController by clicking the background View, you can add the tapGestureRecognizer to the last view in the screen when UIAlertController is popping up, check the code below:
public partial class ViewController : UIViewController
{
public ViewController (IntPtr handle) : base (handle)
{
}
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
// Perform any additional setup after loading the view, typically from a nib.
var alert = new UIAlertController();
alert.Title = "My Title";
alert.Message = "My Message";
UIAlertAction ac1 = UIAlertAction.Create("123",UIAlertActionStyle.Cancel,null);
alert.AddAction(ac1);
this.PresentViewController(alert, true, addGesOnBackGround);
}
public void addGesOnBackGround() {
UIView backView = new UIView();
Array arrayViews = UIApplication.SharedApplication.KeyWindow.Subviews;
if (arrayViews.Length >0)
{
backView = arrayViews.GetValue(arrayViews.Length-1) as UIView;
}
UITapGestureRecognizer tapGestureRecognizer = new
UITapGestureRecognizer((gesture) =>
{
//I never get here
this.DismissViewControllerAsync(true);
});
backView.AddGestureRecognizer(tapGestureRecognizer);
backView.UserInteractionEnabled = true;
}
}