Preventing touch passing from UIControl to ParentView - ios

Question

I have created a custom control for Uber like OTP TextField. I want to consume the touch in my control and not let it propagate through the UIResponder Chain. So I have overridden the methods as described in apple documentation.
extension BVAPasswordTextField {
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
becomeFirstResponder()
}
override func touchesMoved(Set<UITouch>, with: UIEvent?) {
}
override func touchesEnded(Set<UITouch>, with: UIEvent?) {
}
override func touchesCancelled(Set<UITouch>, with: UIEvent?) {
}
override func touchesEstimatedPropertiesUpdated(Set<UITouch>) {
}
}
Now in some view controller I want to dismiss the keyboard when the user taps anywhere outside my custom control.
override func viewDidLoad() {
super.viewDidLoad()
let tapGestureRecogniser = UITapGestureRecognizer(target: self, action: #selector(ViewController.backgroundTapped))
tapGestureRecogniser.numberOfTapsRequired = 1
view.addGestureRecognizer(tapGestureRecogniser)
// Do any additional setup after loading the view, typically from a nib.
}
#objc func backgroundTapped() {
self.view.endEditing(true)
}
But whenever I tap on the textfield backgroundTapped also gets called.
Note:- It is a control where based on enum values you can create different UI Components for taking input. So this control can be shared among the whole team... I won't be the only guy using it.... So I want it to behave exactly like UITextfield in touch scenario

Answer 1

You can handle the tap gesture using UITapGestureRecognizerDelegate. It allows you to decide whether or not gesture should begin. In your case, it should be done basing on the location of the touch.
extension ViewController: UIGestureRecognizerDelegate {
func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
let location = gestureRecognizer.location(in: self.view)
// return true is location of touch is outside our textField
return !textField.frame.contains(location)
}
}
Just make sure you've set a delegate for your gesture at viewDidLoad
tapGestureRecogniser.delegate = self
UPDATE
If I got your setup right, you have a view and some subviews that are used for input. And you want to resignFirstResponder when this super-view is touched. In that case you can use gestureRecognizerShouldBegin like that
func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
let location = gestureRecognizer.location(in: self.view)
for subview in self.view.subviews {
if subview.frame.contains(location) {
return false
}
}
return true
}
In my opinion, if you want to handle some view interaction in a specific way, you need to do it using that specific view. And what you're doing now feels like trying to change behavior on one view, using another view.