ios – 当app处于后台状态Swift时暂停计时器

我的ViewController. swift

func startTimer() {
    timer = NSTimer().scheduleTimerWithTimerInvterval(1.0,target: self,selctor: Selector("couting"),userinfo: nil,repeats: true)
}

func pauseTimer() {
    timer.invalidate()
    println("pausing timer")
}

这是appDelegate.swift

func applicateWillResignActive(application: UIApplication) {
    viewController().pauseTimer()
    println("closing app")
}

它是打印暂停计时器和关闭应用程序,但当我再次打开时,我看到它从未暂停.我该怎么做？

解决方法

你必须设置一个观察者在应用程序进入后台时监听.在ViewController的viewDidLoad()方法中添加以下行.

NSNotificationCenter.defaultCenter().addobserver(self,selector: Selector("myObserverMethod:"),name:UIApplicationDidEnterBackgroundNotification,object: nil)

添加以下功能以接收通知.

func myObserverMethod(notification : NSNotification) {
    println("Observer method called")

    //You may call your action method here,when the application did enter background.
    //ie.,self.pauseTimer() in your case.
}

快乐的编码!!!