使用 AVAudioSession 实现后台播放音乐

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+?(UIBackgroundTaskIdentifier)backgroundPlayerID:(UIBackgroundTaskIdentifier)backTaskId

{

????//?1.?设置并激活音频会话类别

???????AVAudioSession?*session?=?[AVAudioSession?sharedInstance];

????[session?AVAudioSessionCategoryPlayback?error:nil];

????[session?setActive:YES?error:nil];

????//?2.?允许应用程序接收远程控制

????[[UIApplication?sharedApplication]?beginReceivingRemoteControlEvents];

????//?3.?设置后台任务ID

??????UIBackgroundTaskIdentifier?newTaskId?=?UIBackgroundTaskInvalid;

????newTaskId?=?[[UIApplication?sharedApplication]?beginBackgroundTaskWithExpirationHandler:nil];

????if?(newTaskId?!=?UIBackgroundTaskInvalid?&&?backTaskId?!=?UIBackgroundTaskInvalid)?{

????????[[UIApplication?sharedApplication]?endBackgroundTask:backTaskId];

????}

????return?newTaskId;

}

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//后台播放音频设置?

AVAudioSession?*session?=?[AVAudioSession?sharedInstance];???

[session?setActive:YES?error:nil];???

[session?setCategory:AVAudioSessionCategoryPlayback?error:nil];??

???

//让app支持接受远程控制事件?

[[UIApplication?sharedApplication]?beginReceivingRemoteControlEvents];

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//?后台播放任务Id

UIBackgroundTaskIdentifier??_bgTaskId;

?

//?设置音频会话，允许后台播放

_bgTaskId?=?[SoundTool?backgroundPlayerID:_bgTaskId];