Hi all,

You can use the NSTimer class to create timer objects or, more simply, timers. A timer can wait and call a method or selector after defined period of time. for example :- if you want show a seconds clock and stop when it completed 60 seconds then you can create a time with 1 second of period and turn on repeat mode , when defining selector method you have to specify some condition whenever you want to stop this timer.

Declaration :-

var timer: NSTimer?   

Initialization :-

timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target:self, selector:"updateTimer", userInfo: nil, repeats:true)

Start Timer :-

NSRunLoop.currentRunLoop().addTimer(timer!, forMode:NSRunLoopCommonModes)

Defining Timer Selector :-

func updateTimer() {
      //DO SOMETHING COOL
        if CONDITION {    // condition to stop timer  
            timer!.invalidate()
            timer = nil
        }
    }