How to detect a double tap gesture

Swift version: 5.4

Paul Hudson @twostraws May 28th 2019

The iOS UITapGestureRecognizer class has a built-in way to detect a double tap on any view. All you need to do is create the recognizer, set its numberOfTapsRequired property to 2, then add it to the view you want to monitor.

Here's an example:

override func viewDidLoad() {
    super.viewDidLoad()

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

@objc func doubleTapped() {
    // do something here
}