Gesture Recognizers

let doubleTap = UITapGestureRecognizer(target: self, action: #selector(doubleTapHappened(sender:)))
doubleTap.numberOfTapsRequired = 2
doubleTap.numberOfTouchesRequired = 1
let someView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))someView.addGestureRecognizer(doubleTap)
@objc func doubleTapHappened(sender: UITapGestureRecgonizer){
print("Double Tap Must Have Happened")

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