一 · 首先在capabilities 勾选

屏幕快照 2017-09-06 12.55.15.png

二 ·设置 AVAudioSession AVAudioSessionCategoryPlayback

[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];

void EMSystemSoundFinishedPlayingCallback(SystemSoundID sound_id, void* user_data)
{
    AudioServicesDisposeSystemSoundID(sound_id);
}

-(void)run
{
    
    
    
    [self playVibration];
    
    [self playNewMessageSound];
    
    //后台播放声音
  
    [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error:nil];
    [[AVAudioSession sharedInstance] setActive: YES error: nil];
    
    
}

// 播放接收到新消息时的声音
- (SystemSoundID)playNewMessageSound
{
    // 要播放的音频文件地址
//    NSURL *bundlePath = [[NSBundle mainBundle] URLForResource:@"EaseUIResource" withExtension:@"bundle"];
//    NSURL *audioPath = [[NSBundle bundleWithURL:bundlePath] URLForResource:@"in" withExtension:@"caf"];
    
    NSString *str = [[NSBundle  mainBundle]pathForResource:@"in.caf" ofType:nil];
    
    NSURL* audioPath =[NSURL URLWithString:str];
    
    // 创建系统声音，同时返回一个ID
    SystemSoundID soundID;
    AudioServicesCreateSystemSoundID((__bridge CFURLRef)(audioPath), &soundID);
    // Register the sound completion callback.
    AudioServicesAddSystemSoundCompletion(soundID,
                                          NULL, // uses the main run loop
                                          NULL, // uses kCFRunLoopDefaultMode
                                          EMSystemSoundFinishedPlayingCallback, // the name of our custom callback function
                                          NULL // for user data, but we don't need to do that in this case, so we just pass NULL
                                          );
    
    AudioServicesPlaySystemSound(soundID);
    

    
    return soundID;
}

// 震动
- (void)playVibration
{
    // Register the sound completion callback.
    AudioServicesAddSystemSoundCompletion(kSystemSoundID_Vibrate,
                                          NULL, // uses the main run loop
                                          NULL, // uses kCFRunLoopDefaultMode
                                          EMSystemSoundFinishedPlayingCallback, // the name of our custom callback function
                                          NULL // for user data, but we don't need to do that in this case, so we just pass NULL
                                          );
    
    AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
}