nstimer

I'm getting a runtime error of: 2014-07-15 16:49:44.893 TransporterGUI[1527:303] -[_TtC14TransporterGUI11AppDelegate printCountdown]: unrecognized selector sent to instance 0x10040e8a0 when I use the following Swift code to fire a timer: @IBAction func schedule(sender : AnyObject) { var startTime = startDatePicker.dateValue.timeIntervalSinceDate(NSDate()) var endTime = endDatePicker.dateValue.timeIntervalSinceDate(startDatePicker.dateValue) var startDate = NSDate.date() let params = ["startTime": startTime, "startDate": startDate] var counter = NSTimer.scheduledTimerWithTimeInterval(1.0,

When we use a NSTimer, once the call back is called after the mentioned interval, does the UI would be blocked? visakh7 From the documents Timers work in conjunction with run loops. To use a timer effectively, you should be aware of how run loops operate—see NSRunLoop and Threading Programming Guide. Once scheduled on a run loop, the timer fires at the specified interval until it is invalidated. A non-repeating timer invalidates itself immediately after it fires. However, for a repeating timer, you must invalidate the timer object yourself by calling its invalidate method. Calling this method

I'm trying to developing an app that includes a simple Stopwatch feature. I'm using Xcode 6 and the Swift language. Here is the code in FirstViewController @IBAction func Stopwatch (Sender:UIButton) { var startTime = NSTimeInterval() func updateTime(timer:NSTimer) { //Find Current TIme var currentTime = NSDate.timeIntervalSinceReferenceDate() //Find the difference between current time and start time var elapsedTime :NSTimeInterval = currentTime - startTime //calculate the minutes in elapsed time. let minutes = UInt(elapsedTime / 60.0) elapsedTime -= (NSTimeInterval(minutes) * 60) //calculate

My 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") } and this is appDelegate.swift func applicateWillResignActive(application: UIApplication) { viewController().pauseTimer() println("closing app") } It is printing pausing timer and closing app but when I open again I see it never paused. How do I do it correctly? You have to set an observer listening to when the application did enter background. Add the below

I have two NSTimers in my iPhone app. DecreaseTimer works fine, but TimerCountSeconds crashes when I call [timerCountSeconds isValid] or [timerCountSeconds invalidate]. They are used like this: -(id)initialize { //Gets called, when the app launches and when a UIButton is pressed if ([timerCountSeconds isValid]) { [timerCountSeconds invalidate]; } } - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { //Gets called, when you begin touching the screen //.... if ([decreaseTimer isValid]) { [decreaseTimer invalidate]; } timerCountSeconds = [NSTimer scheduledTimerWithTimeInterval:0.1

During debugging my IOS project developed in XCode4 , I initialize and run an NSTimer object. However, the timer stops as soon as I press the scroll view and it continues to run after I release the scroll. Is there a configuration for NSTimer such that timer is not blocked during scrolling? Thanks in advance. Add this single line and try again please [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes]; 来源： https://stackoverflow.com/questions/17423900/nstimer-stops-during-scrolling