iphone - AVAudioPlayer 后台任务不起作用 [iOS]

Question

我已经尝试了一切:

-设置信息.plist 所需的后台模式:应用程序播放音频；

-设置播放器:

 [[AVAudioSession sharedInstance] setDelegate: self];

// allow app continue to play when the screen is locked
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback
                                       error:nil];

UInt32 doSetProperty = 0;
AudioSessionSetProperty ( kAudioSessionProperty_OverrideCategoryMixWithOthers,
                         sizeof (doSetProperty),
                         &doSetProperty
                         );

// Registers the audio route change listener callback function
AudioSessionAddPropertyListener (
                                 kAudioSessionProperty_AudioRouteChange,
                                 audioRouteChangeListenerCallback,
                                 self
                                 );

// Activates the audio session.

NSError *activationError = nil;
[[AVAudioSession sharedInstance] setActive: YES error: &activationError];

[appSoundPlayer prepareToPlay];
[appSoundPlayer setVolume: 1.0];
[appSoundPlayer setDelegate: self];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

我忘记了什么？有什么问题吗？

Answer 1

您需要将音频类别设置为播放:

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&error];

如果您随后希望允许与其他应用程序混合音频，则可以添加此选项，只需确保在将 Audio Session 设置为事件状态之前执行此操作即可。

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionMixWithOthers error:nil];

现在您可以将 Audio Session 设置为事件状态:

[[AVAudioSession sharedInstance] setActive:YES error:&error];