Detect First Touch on Viewcontroller in swift

manpreet Best Answer 2 years ago

I have UIViewController and it have many subviews on. Each subview can be Uibutton, other view controllers, UIView. How to detect when user first tap on screen anywhere. I have used TouchesBegan events but its not work on Subviews. Thanks So much!

manpreet 2 years ago

Add gesture reconginse to the UIVIewController's view

// Add this in the ViewDidLoad method
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.didTapView(sender:)))
self.view.addGestureRecognizer(tapGesture)

@objc
func didTapView(sender: UITapGestureRecognizer) {
  print("View Tapped")
}

You will have to subclass the UI Element's class that you will be using and override the below method to pass touch event to below view in the view's hierarchy. Like so

class CustomView: UIView {
    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        print("Passing all touches to the next view (if any), in the view stack.")
        return false
    }
}

Now use this class in your storyboard, then it will pass the touch event to ViewController's view and hence it will call didTapView method. As you only want first touch event you can keep a flag to check if it's the first touch. One note please don't use UIButton if not needed.