swift - How do I add a timer to an iOS app that ends the game when the timer reaches 0? -

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i making quiz app using swift. want add timer countsdown 60 seconds (1 minute) when reaches 0, game over. how add timer?

this you, put appropriate game logic on updatetimer function , stopcountdowntimer function.

class timertestviewcontroller: uiviewcontroller  {  var totalsecondscountdown = 60 // 60 seconds // timer var timer : nstimer!  override func viewdidload() {     super.viewdidload()      self.startcountdowntimer() }  func updatetimer() {      if self.totalsecondscountdown > 0 {         self.totalsecondscountdown = self.totalsecondscountdown - 1         println("timer countdown : \(self.totalsecondscountdown)")     }     else {         self.stopcountdowntimer();         println("timer stops ...")     }  }  func startcountdowntimer() {      if self.timer != nil {         self.timer.invalidate()         self.timer = nil     }      if self.totalsecondscountdown > 0 {         self.timer = nstimer.scheduledtimerwithtimeinterval(1.0, target: self, selector: "updatetimer:", userinfo: nil, repeats: true)         nsrunloop.currentrunloop().addtimer(self.timer, formode: nsrunloopcommonmodes)         self.timer.fire()     }  }  func stopcountdowntimer() {     if self.timer != nil {         self.timer.invalidate()         self.timer = nil     }  } }

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