如果LongPressReconizerState结束，则计划的计时器不会结束

Question

我尝试通过AVAudioPlayer构建音乐播放器。我的audioPlayer有效！现在我尝试构建一个双功能按钮：

1. 一次点击：玩家从头开始（player.currentTime = 0）（工作）
2. Longpess：玩家以0.5秒为单位开始倒带，并结束＆＃34;倒带过程＆＃34;如果按钮已释放

我的代码（摘要）

var player = AVAudioPlayer()
@IBOutlet weak var rewindButton: UIButton!

override func viewDidLoad() {
        super.viewDidLoad()
        let tapGesture = UITapGestureRecognizer(target: self, action:    #selector(rewindTapAction))  //Tap function will call when user tap on button
        let longGesture = UILongPressGestureRecognizer(target: self, action: #selector(rewindLongPressAction(_:))) //Long function will call when user long press on button.
        tapGesture.numberOfTapsRequired = 1
        rewindButton.addGestureRecognizer(tapGesture)
        rewindButton.addGestureRecognizer(longGesture)
} 

@objc func rewindTapAction(){
    print("tapped")
    player.currentTime = TimeInterval(0)
}

@objc func rewindLongPressAction(_ gestureRecognizer: UILongPressGestureRecognizer){
    print("longpress")
    var rewindTimer : Timer!

    if gestureRecognizer.state == .began{
        print("longpress started")

        rewindTimer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true, block: { Timer in
                            self.player.currentTime = TimeInterval( self.player.currentTime - 0.5)
                            print("timer")
                        })

    }else if gestureRecognizer.state == .ended || gestureRecognizer.state == .cancelled{
        print("longpress ended")
        rewindTimer.invalidate()
    }

}






我的问题是：

在我释放rewindButton（longpress）后，倒带计时器不会停止。为什么？

Answer 1

您应该在rewindLongPressAction函数的范围之外定义rewindTimer。使用手势状态.ended再次调用函数时，它不再具有与rewindTimer相同的引用。