Pausing timer when app is in background state Swift

Question

My ViewController.swift

func startTimer() {
    timer = NSTimer().scheduleTimerWithTimerInvterval(1.0,target: self,selctor: Selector(\"couting\"),userinfo: n         


        

Answer 1

You are creating a new object and calling pauseTimer() on it:

viewController().pauseTimer()   // This line causes issue viewController(), creates a new instance

Instead of creating new object, either you should pass that instance to AppDelegate and call pauseTimer() on existing object or Listen for UIApplicationDidEnterBackgroundNotification notification in your view controller class and pause timer from there.