ios - Show GameCenter login later if user dismisses login screen at start of game? -

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we present gamecenter login screen upon game's launch. @ end of game, show gamecenter button lets users view achievements , game's leaderboards. if dismissed original screen , aren't logged in, how can present login screen again? here's code we're using, it's not working.

override func viewdidload() {     super.viewdidload()      // configure view     let skview = view as! skview     skview.multipletouchenabled = false     //skview.showsnodecount = true     //skview.showsfps = true      // show intro scene     let introscene = introscene(size: skview.bounds.size, controller: self)     introscene.scalemode = .aspectfill     skview.presentscene(introscene)      // authenticate gamecenter player     authenticategamecenterplayer()  }   private func authenticategamecenterplayer() {     var localplayer = gklocalplayer.localplayer()     localplayer.authenticatehandler = {(viewcontroller : uiviewcontroller!, error : nserror!) -> void in         if ((viewcontroller) != nil) {             self.presentviewcontroller(viewcontroller, animated: true, completion: nil)         } else {             println((gklocalplayer.localplayer().authenticated))         }     } }   func showleaderboard() {     // user logged gamecenter?     if (!gklocalplayer.localplayer().authenticated) {         println("local player not authenticated")         authenticategamecenterplayer()         return     }      // if here, user authenticated present leaderboards     var gcviewcontroller = gkgamecenterviewcontroller()     gcviewcontroller.gamecenterdelegate = self     gcviewcontroller.viewstate = gkgamecenterviewcontrollerstate.leaderboards     gcviewcontroller.leaderboardidentifier = "highscoresleaderboard"     self.showviewcontroller(gcviewcontroller, sender: self)     self.navigationcontroller?.pushviewcontroller(gcviewcontroller, animated: true) }

game center remembers users log-in preferences , if user dismisses log-in dialog many times, stop being displayed, when call localplayer.authenticatehandler

the recommended way of handling display message telling user log in through game center app


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