on single tap UIBarButton display toast and on double tap back action need to perform

Question

I have an UIBarButton in navigation bar, while clicking on back button (first tap) i need to display toast (like warning), on double tap i need to exit from the page in swift,

Answer 1

Add an target-action on UIButton for the control event UIControlEventTouchDownRepeat, and do action only when the touch's tapCount is 2. Like below in Swift 3

button.addTarget(self, action: #selector(multipleTap(_:event:)), for: UIControlEvents.touchDownRepeat)

And Then add selector as below

func multipleTap(_ sender: UIButton, event: UIEvent) {
    let touch: UITouch = event.allTouches!.first!
    if (touch.tapCount == 2) {
        // do action.
    }
}