CODEWITHSUNDEEP
iosswiftuibutton
user11729819
user11729819

Reputation: 107

Touch down repeat event does not works

I want my button to change its background image when the user clicks on it twice. For this purpose i am using touchDownRepeat event. However it does not works.

button.addTarget(self, action: #selector(clickedRepeatOnPlate), for: .touchDownRepeat)

Upvotes: 2

Views: 867

Answers (2)

alxlives
alxlives

Reputation: 5212

As for the Apple's oficial documentation about .touchDownRepeat :

A repeated touch-down event in the control; for this event the value of the UITouch tapCount method is greater than one.

This event will trigger every time the user taps the button more than once, so four taps will trigger the event three times.

To trigger only double taps, you need to create a UITapGesture and set 2 on its numberOfTapsRequired:

  let tapGesture = UITapGestureRecognizer(target: self, action: #selector(clickedRepeatOnPlate))
  tapGesture.numberOfTapsRequired = 2
  button.addGestureRecognizer(tapGesture)

Edit

If you need to get the sender button as a function parameter, you can do as follows:

 func addDoubleTapEvent() {
   let tapGesture = UITapGestureRecognizer(target: self, action: #selector(clickedRepeatOnPlate(gesture:)))
   tapGesture.numberOfTapsRequired = 2
   button.addGestureRecognizer(tapGesture)  
 }

 @objc func clickedRepeatOnPlate(gesture: UITapGestureRecognizer) {
     guard let button = gesture.view as? UIButton else { return }
     print(button.titleLabel?.text)
 }

Output

Optional("button")

Upvotes: 4

Fab
Fab

Reputation: 836

This let you to set a gesture for double tap on a view.

let tap = UITapGestureRecognizer(target: self, action: #selector(doubleTapped))
tap.numberOfTapsRequired = 2
view.addGestureRecognizer(tap)

Remember that a UIButton is a UIView

Upvotes: 1

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