ios - App enters background determine current ViewController -

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i working on ios app , want add notification notification center if , if user looking @ view controller when left app. app has count down timer , if looking @ count down timer , go send text or other app send notification once timer @ 0. if on view controller have no need send notification. great thanks.

within uiviewcontroller wish detect app going background going need register uiapplicationwillresignactivenotification , uiapplicationwillterminatenotification notifications nsnotificationcenter when viewwillappear called.

nsnotificationcenter .defaultcenter() .addobserver(self, selector: selector("callback"), name: uiapplicationwillresignactivenotification, object: nil) nsnotificationcenter .defaultcenter() .addobserver(self, selector: selector("callback"), name: uiapplicationwillterminatenotification, object: nil)

when screen calls method handling notification, schedule uilocalnotification trigger @ current time, plus timer count. can use init(timeintervalsincenow:) on nsdate this.

var firedate = nsdate(timeintervalsincenow: 25)  var localnotification = uilocalnotification()  localnotification.firedate = firedate  uiapplication .sharedapplication() .schedulelocalnotification(localnotification)

and remove uiviewcontroller observer. 

nsnotificationcenter .defaultcenter() .removeobserver(self)

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