背景音樂的問題

Question

我有問題，這樣的代碼：

-(void)playSong 
{ 
    // ... 
    NSLog(@"playing %i", currentSONG); 
    VKAudio* song = [audios objectAtIndex:currentSONG]; 
    if (player == nil) { // create player object when first called 
     player = [[AVPlayer alloc] initWithURL:[self urlForVKAudio:song]]; 
     [player play]; 
     [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil]; // turn on in background 
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleAVPlayerItemDidPlayToEndTimeNotification) name:AVPlayerItemDidPlayToEndTimeNotification object:nil]; 
    } 
    else { 
     [player replaceCurrentItemWithPlayerItem: 
     [[AVPlayerItem alloc] initWithURL:[self urlForVKAudio:song]]]; 
     [player play]; // <- this is not working when phone is blocked & screen is off 
    } 
} 

這裏的問題是，當我切換到BG模式，同時播放音樂在播放結束當前項目，但下一個項目不在播放，所以在後臺模式下方法

[player play]; 

什麼都沒做......我做錯了什麼？ （bg音樂模式開啓）

Answer 1

據我所見，你的AudioSession設置正確，但不要激活它。

這是我使用的是什麼：

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil]; 
[[AVAudioSession sharedInstance] setActive:YES error:nil]; 
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents]; 
[self becomeFirstResponder];