ios - How to create a timer (chrono) with NSDateFormatter? -

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this regular timer (chrono) minutes , seconds. works fine there way have same result nsdateformatter.

var min = 0 var sec = 0  func stringfromtimeinterval(interval: nstimeinterval) -> string {     let interval = int(interval)     let seconds = interval % 60     let minutes = (interval / 60)     return string(format: "%2d:%02d",minutes, seconds)  }  func updatetimer(){     sec++     self.timeelapsed.text = self.stringfromtimeinterval(double(sec)) }

here attempt : 

var sec = 0   func thetime(interval:nstimeinterval) -> string {     var dateformatter = nsdateformatter()     var date = nsdate(timeintervalsince1970: nstimeinterval())     dateformatter.dateformat = "mm:ss"     return dateformatter.stringfromdate(date)   }    func updatethetime(){     sec++     self.newtimer.text = self.thetime(double(sec))   }
  • i'm doing wrong because 00:00.
  • how can make work?

you can use nsdate , nsdateformatter time string. create object of nsdateformatter , nsdate, set style of time nsdateformmatter, call stringfromdate time string. 

    var dateformatter = nsdateformatter()     var date = nsdate(timeintervalsince1970: interval)     dateformatter.dateformat = "mm-ss"     dateformatter.stringfromdate(date)

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