Problems with beginReceivingRemoteControlEvents

i trying app respond events pausing headphones, or controls in multitasking bar. in view loads mpmovieplayercontroller, put in viewdidload:
update: figured out issue is, having problems this:

code:

 [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(playbackstatechanged:) name:mpmovieplayerplaybackstatedidchangenotification object:player];      

i added viewdidload method, not sure needs put in playbackstatechanged notification method, playbackstate read-only property. in didreceiveremoteevents, set to:

code:

case uieventsubtyperemotecontroltoggleplaypause:                                  [self playorstop];                                  break;

with playorstop code as:

code:

if (player.playbackstate == mpmovieplaybackstateplaying) {         [player pause];     }     if (player.playbackstate == mpmovieplaybackstatepaused) {         [player play];     }

when start playing, , send app background, pull multitasking bar , click pause, pauses, when click play, nothing happens. why not detecting change in playbackstate?

 

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