UITapGestureRecognizer tap on self.view but ignore subviews

Question

I need to implement a feature that will invoke some code when I double tap on the self.view (view of UIViewCotroller). But the problem that I have other UI obje

Answer 1

If you don't want your 'double-tap recogniser' to conflict with your buttons and/or other controls, you can set self as UIGestureRecognizerDelegate and implement:

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool
{
    return !(touch.view is UIControl)
}

Answer 2

Variant using CGPoint you touch (SWIFT 4.0)

class MyViewController: UIViewController, UIGestureRecognizerDelegate {

  func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {

// Get the location in CGPoint
    let location = touch.location(in: nil)

// Check if location is inside the view to avoid
    if viewToAvoid.frame.contains(location) {
        return false
    }

    return true
  }
}

Answer 3

Plus the above solutions, do not forget to check User Interaction Enabled of your sub-view.

Answer 4

I had to prevent the gesture on the child view. The only thing that worked is to allow and keep the first view and prevent gesture in all the next views:

   var gestureView: UIView? = nil

    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        if (gestureView == nil || gestureView == touch.view){
            gestureView = touch.view
            return true
        }
        return false
     }

Answer 5

And for the Swift variant:

func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
    if touch.view.isDescendantOfView(yourSubView){
        return false
    }
    return true
}

Good to know, isDescendantOfView returns a Boolean value indicating whether the receiver is a subview of a given view or identical to that view.

Answer 6

Clear Swift way

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
    return touch.view == self.view
}