How to detect a double tap gesture

Paul Hudson    September 20th 2017    @twostraws

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
}

Available from iOS 3.2

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This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.