Detect any tap outside the current view

Question

Is there a way to detect any tap outside the current view? I unsuccessfully tried to implement something with the hitTest method but I am not sure to understand it well.

Answer 1

What you have to do is, In touchesBegan you have to get the first touch object from the touches set and you have to check the location of that touch in a view(inside which you want to detect the touch).

After you get the location of touch in View, you have to check whether your currentView(The view which you have to check whether tap was inside or outside).

If currentView's frame contains the touch location, that means touch has occurred inside the view otherwise outside.

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    super.touchesBegan(touches, with: event)

    let touch = touches.first
    guard let location = touch?.location(in: self.view) else { return }
    if !currentView.frame.contains(location) {
        print("Tapped outside the view")
    } else {
        print("Tapped inside the view")
    }
}

Hope it Helps!

Answer 2

You can use UIGestureRecognizerDelegate protocol

    extension YourViewController: UIGestureRecognizerDelegate {

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

This will only returns "true" when the touch was on the background view but "false" if it was inside the your View.

Note : The identity operator === to compare touch.view with self.view. You want to know whether both variables refer to the same object.

And in viewDidLoad() you will create the gestureRecognizer and set delegate.

let gestureRecognizer = UITapGestureRecognizer(target: self,action: #selector(yourActionMethod))
gestureRecognizer.cancelsTouchesInView = false
gestureRecognizer.delegate = self
view.addGestureRecognizer(gestureRecognizer)