我有几天这个问题了，我没有做错什么。

我的应用程序基本上只是创建一些计时器。我需要阻止它们并创建新的。但是目前停止它们是行不通的。

self.timer = NSTimer.scheduledTimerWithTimeInterval(timeInterval, target:self, selector: "timerDidEnd:", userInfo: "Notification fired", repeats: false)

那是我的计时器

func timerDidEnd(timer:NSTimer){
    createUnrepeatedAlarmWithUpdateInterval()
}

因为我的计时器不想停止，所以我目前正在使用未重复的计时器，并在计时器停止后自行启动。

func stopAlarm() {

    if self.timer != nil {
        self.timer!.invalidate()
    }
    self.timer = nil
    self.timer = NSTimer()
}

这就是我停止计时器的方式。

alarmManager.stopAlarm()
alarmManager.createUnrepeatedAlarmWithUpdateInterval()

我stopAlarm()在创建新计时器之前先调用该函数。

我真的不知道我在做什么错，所以我很感谢每个答案:)

class AlarmManager: ViewController{

private var timer : NSTimer?
private var unrepeatedTimer : NSTimer?
private let notificationManager = NotificationManager()
private var current = NSThread()
private let settingsViewController = SettingsViewController()

func createRepeatedAlarmWithUpdateInterval(){

    var timeInterval:NSTimeInterval = settingsViewController.getUpdateIntervalSettings()

    if timer == nil{
    timer = NSTimer.scheduledTimerWithTimeInterval(timeInterval,
        target: self,
        selector: "repeatedTimerDidEnd:",
        userInfo: "Notification fired",
        repeats: true)
    }
}
func repeatedTimerDidEnd(repeatedTimer:NSTimer){
    ConnectionManager.sharedInstance.loadTrainings(settingsViewController.getServerSettings())
    createUnrepeatedAlarm(10)
}

func createUnrepeatedAlarm(timeInterval:Double){

    unrepeatedTimer = NSTimer.scheduledTimerWithTimeInterval(timeInterval,
        target: self,
        selector: "unrepeatedTimerDidEnd:",
        userInfo: "Notification fired",
        repeats: false)
}
func unrepeatedTimerDidEnd(unrepeatedTimer:NSTimer){
    notificationManager.createNotification(self, reminderType: NotificationManager.ITEMRATINGREMINDER)
    notificationManager.createNotification(self, reminderType: NotificationManager.ITEMREMINDER)
    print("UnrepeatedAlarm ended")
}

func stopAlarm(){
    print("StopAlarm triggered")
    if (timer != nil)
    {
        print("stoptimer executed")
        timer!.invalidate()
        timer = nil
    }

    if (unrepeatedTimer != nil)
    {
        unrepeatedTimer!.invalidate()
        unrepeatedTimer = nil
    }
}
}

多数民众赞成在整个类的代码。也许有帮助：D