swift - How to add countdowntimer which will run in whole iOS application? -


i need add global timer of 60 minutes in application show in viewcontrollers. not able implement feature.

i have implemented timer in 1 viewcontroller till now. here code: 

 var timercount = 3600 var timer = timer()  timer = timer.scheduledtimer(timeinterval: 1.0, target: self, selector: #selector(update), userinfo: nil, repeats: true)  func update() {      if(timercount > 0){         let minutes = string(timercount / 60)         let seconds = string(timercount % 60)         timelbl.text = minutes + ":" + seconds         timercount -= 1     }     else {         timer.invalidate()         let vc = storyboard?.instantiateviewcontroller(withidentifier: "navigateviewcontroller")         navigationcontroller?.pushviewcontroller(vc!, animated: true)      }  }

i need show timer value in every viewcontroller of application.

// create  class timermanager  class timermanager {     var timercount = 3600         static let sharedinstance = timermanager()     var timer: timer?      init() {          self.timer = timer.scheduledtimer(timeinterval: 1.0, target: self, selector: #selector(update), userinfo: nil, repeats: true)       }      @objc func update() {         if(timercount > 0){             let minutes = string(timercount / 60)             let seconds = string(timercount % 60)             timercount -= 1         }         else {             self.timer?.invalidate()           }     }   }   // @ view controller   can access  timercount    print(timermanager.sharedinstance.timercount)

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