Swift - 计时器不会停止 [英] Swift - Timer doesn't stop

问题描述

我有以下代码:

class firstVC: UIViewController {
    var timer : Timer?

    func scheduledTimerWithTimeInterval(){
        timer = Timer.scheduledTimer(timeInterval: 60, target: self, 
        selector: #selector(self.anotherFunc), userInfo: nil, repeats: 
        true)
    }

    override func viewDidAppear(_ animated: Bool) {
        scheduledTimerWithTimeInterval()
    }
}

我试图停止计时器但没有成功:

I'm trying to stop the timer without success:

func stopTimer() {
    if timer != nil {
        timer?.invalidate()
        timer = nil
    }
}

override func viewDidDisappear(_ animated: Bool) {
    super.viewDidDisappear(animated)
    stopTimer()
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    stopTimer()
}

我什至尝试将停止功能放在 applicationWillResignActive而在 applicationDidEnterBackground 中，但它并没有停止:

I even tried to put the stop function in applicationWillResignActive And in applicationDidEnterBackground but it didn't stop:

firstVC().stopTimer()

感谢您的帮助，谢谢.

推荐答案

经过研究我找到了解决方案，
唯一对我有用的是在 AppDelegate 文件中创建函数并在需要时调用它们，
下面是代码，timerSwitch 函数:

After research I found a solution,
The only thing that worked for me is to create functions in AppDelegate file and call them when needed,
Here is the code, the timerSwitch function:

    func timerSwitch()
    {
        if (timerStatus) {
            checkStateTimer = Timer.scheduledTimer(
                timeInterval: 60, 
                target:self, 
                selector: #selector(self.yourFunction), 
                userInfo: nil, repeats: true)
        } else {
            checkStateTimer?.invalidate()
        }
    }

    func stopTimer()
    {
        timerStatus = false
        timerSwitch()

    }

    func startTimer()
    {
        timerStatus = true
        timerSwitch()

    }

虽然 'yourFunction' 是您想要在计时器启动时执行的内容，
在我的情况下是发送心跳.
然后我在AppDelegate中调用的timerSwitch就是下面的函数:

While 'yourFunction' is what you want to execute when the timer starts,
In my case is sending heartbeat.
Then I called the timerSwitch is the following functions in AppDelegate:

    func applicationWillResignActive(_ application: UIApplication) {
        stopTimer()
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        stopTimer() 
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        startTimer()
    }

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