Play different music in a short period of time，the player can not be stopped

[a363211861]

In my viewController， call the playInfo: function many times in a short period of time，then pop the viewController(viewDidDisappear: is called)，music is still playing。

-(void)viewDidDisappear:(BOOL)animated { [super viewDidDisappear:animated];

[_audioPlayer stop];
_audioPlayer.delegate = nil;
_audioPlayer = nil;

}

-(void)playInfo:(NSDictionary *)info { self.musicInfo = info;

if (_audioPlayer) {
    [_audioPlayer stop];
    _audioPlayer.delegate = nil;
}
_audioPlayer = [[AudioPlayer alloc] init];
_audioPlayer.delegate = self;

NSURL *url = [self getPlayURL:info]; [_audioPlayer setDataSource:[_audioPlayer dataSourceFromURL:url] withQueueItemId:url]; }

[a363211861]

I found dealloc method of audioPlayer never been called，In my project.  I think the reason may be retain cycle on self with blocks。 such as the code: [fastApiQueue addOperationWithBlock:^ { pthread_mutex_lock(&playerMutex); { ....... [self clearQueue]; ....... } pthread_mutex_unlock(&playerMutex); }];