iphone - ios media picker shows only white screen/stuck -


so i'm making music application project, , allows user create own music playlist. when clicked on show media picker button shows white screen, it doesn't happen when view contains media picker initial view controller. when come segue media picker view controller shows white screen if tapped button.

here code media picker view controller:

var mymusicplayer: mpmusicplayercontroller?  override func viewdidload() {     super.viewdidload()      var buttonpickandplay = uibutton.buttonwithtype(.system) as? uibutton      if let pickandplay = buttonpickandplay{          pickandplay.frame = cgrect(x: 0, y: 0, width: 200, height: 37)         pickandplay.center = cgpoint(x: view.center.x, y: view.center.y - 50)         pickandplay.settitle("pick , play", forstate: .normal)         pickandplay.addtarget(self,             action: "displaymediapickerandplayitem",             forcontrolevents: .touchupinside)          view.addsubview(pickandplay)     } }  override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. }  func displaymediapickerandplayitem(){      var mediapicker = mpmediapickercontroller(mediatypes: .anyaudio)      if let picker = mediapicker{          println("successfully instantiated media picker")         picker.delegate = self         picker.allowspickingmultipleitems = true         picker.showsclouditems = true         picker.prompt = "pick song please..."         self.view.addsubview(picker.view)         presentviewcontroller(picker, animated: true, completion: nil)     } else {         println("could not instantiate media picker")     }  }  func mediapicker(mediapicker: mpmediapickercontroller!,     didpickmediaitems mediaitemcollection: mpmediaitemcollection!){          println("media picker returned")          /* instantiate music player */         mymusicplayer = mpmusicplayercontroller()          if let player = mymusicplayer{             player.begingeneratingplaybacknotifications()              /* notified when state of playback changes */             nsnotificationcenter.defaultcenter().addobserver(self,                 selector: "musicplayerstatechanged:",                 name: mpmusicplayercontrollerplaybackstatedidchangenotification,                 object: nil)              /* notified when playback moves 1 item             other. in recipe, going allow             our user pick 1 music file */             nsnotificationcenter.defaultcenter().addobserver(self,                 selector: "nowplayingitemischanged:",                 name: mpmusicplayercontrollernowplayingitemdidchangenotification,                 object: nil)              /* , notified when volume of             music player changed */             nsnotificationcenter.defaultcenter().addobserver(self,                 selector: "volumeischanged:",                 name: mpmusicplayercontrollervolumedidchangenotification,                 object: nil)              /* start playing items in collection */             player.setqueuewithitemcollection(mediaitemcollection)             user.mdci = mediaitemcollection             player.play()              /* dismiss media picker controller */             mediapicker.dismissviewcontrolleranimated(true, completion: nil)          }    }

mpmediapickercontroller uiviewcontroller.
don't show in screen currentviewcontroller.view.addsubview(picker.view).

when show presentviewcontroller(picker, animated: true, completion: nil), it's correct way.

in delegate methods, when calling mediapicker.dismissviewcontrolleranimated(true, completion: nil), still had mediapicker.view subview of currentviewcontroller.view.


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