ios - Animate background when entering foreground -

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i working on stopwatch app begins flashing when approaching limit , again when overtime. works great except when app pushed background , brought foreground again. @ time animation not start.

i have tried moving code applicationwillenterforeground , applicationdidbecomeactive produces fatal error:

unexpectedly found nil while unwrapping optional value

am missing basic here?

there more code of course (calculations, etc.), relevant section. (edit: i've expanded provide better view of i'm doing.)

@ibaction func start(_ sender: anyobject) {     if timeron == 0 {         mytimer = timer.scheduledtimer(timeinterval: 0.1, target:self, selector: #selector(viewcontroller.updatecounter), userinfo: nil, repeats: true)         starttime = nsdate.timeintervalsincereferencedate         timeron = 1         redoryellow = "white"         startbutton.superview?.sendsubview(toback: startbutton)         background.superview?.sendsubview(toback: background)         pickermask.ishidden = false     } } ....       func animatelight() {      if redoryellow == "red" {         print("red")          //background.superview?.sendsubview(toback: background)          uiview.animate(withduration: 0.3, delay: 0.01, options:[uiviewanimationoptions.repeat, uiviewanimationoptions.allowuserinteraction], animations: {             self.background.backgroundcolor = uicolor.red             self.background.backgroundcolor = uicolor.white             }, completion: nil)      } else if redoryellow == "yellow" {         print("yellow")          //background.superview?.sendsubview(toback: background)          uiview.animate(withduration: 1, delay: 0.1, options:[uiviewanimationoptions.repeat, uiviewanimationoptions.allowuserinteraction], animations: {             self.background.backgroundcolor = uicolor.yellow             self.background.backgroundcolor = uicolor.white             }, completion: nil)     } }  func updatecounter() {     let currenttime = nsdate.timeintervalsincereferencedate     var elapsedtime: timeinterval = currenttime - starttime     totaltime = elapsedtime     if totaltime >= partbasetimes[numberofselectedpart] {         if redoryellow != "red" {             redoryellow = "red"             animatelight()         }     } else if totaltime >= (partbasetimes[numberofselectedpart] - 30) {         if redoryellow != "yellow" {             redoryellow = "yellow"             animatelight()         }     }      let minutes = uint8(elapsedtime / 60.0)     elapsedtime -= (timeinterval(minutes) * 60)     let seconds = uint8(elapsedtime)     elapsedtime -= timeinterval(seconds)     let fractionofsecond = uint8(elapsedtime * 10)     let strminutes = string(format: "%02d", minutes)     let strseconds = string(format: "%02d", seconds)     let strfractionofsecond = string(format: "%01d", fractionofsecond)     talktimer.text = "\(strminutes):\(strseconds).\(strfractionofsecond)"     }


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