Press-and-hold button for “repeat fire”

Question

I have referred to countless other questions about a press-and-hold button but there aren\'t many related to Swift. I have one function connected to a button using the touch

Answer 1

I took a different approach when coming up with my own solution. I created a UIButton subclass and enclosed all the solution inside. The difference is that instead of using an IBAction for the handler I created a property in the UIButton

class RapidFireButton: UIButton {

    private var rapidFireTimer: Timer?
    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonInit()
    }

    init() {
        super.init(frame: .zero)
        commonInit()
    }

    private func commonInit() {
        addTarget(self, action: #selector(touchDownHandler), for: .touchDown)
        addTarget(self, action: #selector(touchUpHandler), for: .touchUpOutside)
        addTarget(self, action: #selector(touchUpHandler), for: .touchUpInside)
    }

    @objc private func touchDownHandler() {
        rapidFireTimer?.invalidate()
        rapidFireTimer = nil
        tapHandler(self)
        rapidFireTimer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true, block: { [unowned self] (timer) in
            self.tapHandler(self)
        })
    }

    @objc private func touchUpHandler() {
        rapidFireTimer?.invalidate()
        rapidFireTimer = nil
    }

    var tapHandler: (RapidFireButton) -> Void = { button in

    } 
}

Usage is basically creating an outlet for the button and implementing the handler like so

rapidFireButton.tapHandler = { button in
    //do stuff
}