Question

我在项目中使用NSTimer：

var clickTimer: Timer?

override func mouseDown(with event: NSEvent) {
    clickTimer = Timer.scheduledTimer(timeInterval: 2.0, target: self, selector: #selector(close(timer:)), userInfo: nil, repeats: false)
}

然后我在其中使它无效

override func mouseUp(with event: NSEvent) {
    if let timer = self.clickTimer {
        timer.invalidate()
    }
}

mouseUp内的代码正在运行，但计时器的close方法仍在2秒内运行。为什么无效无效？

Answer 1

我现在看到了。，您不想重新声明您的clickTimer，所以您要做的就是

if (self.clickTimer == nil) { 
    self.clickTimer = Timer.scheduledTimer(timeInterval: 2.0, target: self, selector: #selector(close(timer:)), userInfo: nil, repeats: false) 
}

只是想一想，您多次重新初始化clicktimer，先前的成功成功了，但是您不小心重新声明了一个新的计时器.. hmm ..

为了安全起见，我还建议您在self.clickTimer = nil之后添加timer.invalidate()

Answer 2

您使self.clickTimer的实例无效，应该使self.clickTimer无效

override func mouseUp(with event: NSEvent) {
  if let timer = self.clickTimer {
      self.clickTimer.invalidate()
  }
}

更新

我知道，您没有触发clickTimer！首先，如果要执行此操作，则必须触发此变量-> clickTimer.fire（）

然后，当您希望无效时，

'Timer.scheduledTimer(timeInterval: 2.0, target: self, selector: #selector(close(timer:)), userInfo: nil, repeats: false)

当您要声明clickTimer而不是要使其无效时自动运行!!!

Answer 3

尝试此代码，首先使其无效，然后删除引用。

override func mouseUp(with event: NSEvent) {
    self.clickTimer?.invalidate()
    self.clickTimer = nil
}

Answer 4

多次调用mouseDown(with:)时会出现问题，原来的计时器将被替换，因此，您没有引用使其无效。

var clickTimer: Timer?

override func mouseDown(with event: NSEvent) {
    clickTimer?.invalidate()
    clickTimer = Timer.scheduledTimer(timeInterval: 2.0, target: self, selector: #selector(close(timer:)), userInfo: nil, repeats: false)
}

override func mouseUp(with event: NSEvent) {
    clickTimer?.invalidate()
}

Answer 5

尝试一下

私有变量clickTimer：NSTimer？

func functionname() {
        guard clickTimer == nil else { return }
        clickTimer = NSTimer.scheduledTimerWithTimeInterval(15, target: self, selector: "fetchWallPosts", userInfo: nil, repeats: true)
    }

或

self. clickTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: (#selector(yourmethod)), userInfo: nil, repeats: true)

Answer 6

尝试-

if (self.clickTimer == nil) { 
self.clickTimer = Timer.scheduledTimer(timeInterval: 2.0, target: self, selector: #selector(close(timer:)), userInfo: nil, repeats: false) 
}

NSTimer无效无法正常工作

6 个答案:

更新