ios - 我如何使用 UILongPressGestureRecognizer 计算长按按钮的时间

Question

我如何计算使用 UILongPressGestureRecognizer 按下按钮的时间；我希望在 displayLabel.text 中打印长按计数时间

我已经尝试了最可行的方法。

@IBOutlet weak var buttonPressed: UIButton!
@IBOutlet weak var displayLabel: UILabel!

var buttonPressedCount : Int = 0

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    let longPressObj = UILongPressGestureRecognizer(target: self, action: #selector(longPressButton))
    longPressObj.minimumPressDuration = 2
    longPressObj.numberOfTouchesRequired = 1
    self.view.addGestureRecognizer(longPressObj)


    // below statement is not a right one but i tried many possiblity including this one.
    if longPressObj.minimumPressDuration == TimeInterval(2) {
        displayLabel.text = "Longpressed for 2 seconds"
    } else if longPressObj.minimumPressDuration == TimeInterval(3) {
        displayLabel.text = "3"
    } else if longPressObj.minimumPressDuration == TimeInterval(3) {
        displayLabel.text = "4"
    }


}
 @IBAction func longPressButton() {

    displayLabel.text = "Button pressed for \(buttonPressedCount)"
}

我想显示长按 NOT BUTTON CLICKED 的时间。

enter image description here

提前致谢!

编辑:-1.我只想在用户执行长按时显示运行持续时间。我真的很感激实时计数2. 停止按下后显示总持续时间也会有帮助。

( /image/ppr0W.png )

Answer 1

你的目标函数应该包括发送者，然后你可以得到 UILongPressGestureRecognizer 的状态。

这是 Apple official document .

首先保存手势开始时间，然后你可以使用当前时间减去开始按下时间得到状态.ended(或/和.cancelled)的持续时间>, .failed).

示例代码:

class ViewController: UIViewController {
    var touchBeginTime: Double = 0
    var touchCountTimer: Timer?

    override func viewDidLoad() {
        super.viewDidLoad()

        let longPressObj = UILongPressGestureRecognizer(target: self, action: #selector(longPressButton(sender:)))
        longPressObj.minimumPressDuration = 2
        longPressObj.numberOfTouchesRequired = 1
        self.view.addGestureRecognizer(longPressObj)
    }

    @IBAction func longPressButton(sender: UILongPressGestureRecognizer) {
        switch sender.state {
            case .began:
                touchCountTimer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true, block: { (timer) in
                    print("User pressing \(Date().timeIntervalSince1970 - self.touchBeginTime) sec.")
                })
                touchBeginTime = Date().timeIntervalSince1970
                break;

            case .changed:
                //print("Long pressed changed \(Date().timeIntervalSince1970 - touchBeginTime)")
                break;

            case .ended, .cancelled, .failed:
                touchCountTimer?.invalidate()
                print("User pressed total \(Date().timeIntervalSince1970 - touchBeginTime) sec.")
                break;

            default:
                break;
        }
    }
}