如何在iOS睡眠计时器被调用时停止音频

Question

我想在iOS睡眠计时器被调用时停止我的音频应用。

就像潘多拉的应用程序。
http://help.pandora.com/customer/portal/articles/24324-ios-sleep-timer-with-pandora

轻按"时钟"app，轻按"计时器"，选择一个时间，轻按"计时器结束时"，轻按"停止"玩

这将使你的潘多拉程序休眠，如果它正在运行。

我可以看到inInterruptionState == kAudioSessionBeginInterruption被调用时iOS睡眠计时器结束，但我怎么能检测如果它的睡眠计时器或只是中断像电话呼叫?

这是我的代码。目前，我的应用程序只是在iOS睡眠计时器结束后重新开始播放。

// Audio Interruption Listener
void MyInterruptionListener(void *inClientData, UInt32 inInterruptionState) {
    if (inInterruptionState == kAudioSessionBeginInterruption) {        
        [[DOSpeechManager sharedInstance] audioSessionBeginInterruption];
    }
    if (inInterruptionState == kAudioSessionEndInterruption) {
        [[DOSpeechManager sharedInstance] audioSessionEndInterruption];
    }
}
- (void)audioSessionBeginInterruption {
    if ([_MyAcaTTS isSpeaking] && [_MyAcaTTS isPaused] == NO) {
        [_MyAcaTTS pauseSpeakingAtBoundary:AcapelaSpeechImmediateBoundary];
        [self setAudioSettionStatus:NO];
        _audioInterruptedWhileSpeaking = YES;
    }
}
- (void)audioSessionEndInterruption {
    if (_audioInterruptedWhileSpeaking) {
        [self setAudioSettionStatus:YES];
        [_MyAcaTTS continueSpeaking];
    }
}
- (void)setAudioSettionStatus:(BOOL)status {
    AudioSessionSetActive(status);
    [_MyAcaTTS setActive:status];
    //cancel audio interrupted flag
    if (status) {
        _audioInterruptedWhileSpeaking = NO;
    }
}

Answer 1

关键不在于检测中断的来源，而在于知道中断后应用程序是否应该恢复。

AVAudioSession API将在音频会话中断时发送通知。在这个通知中，操作系统给出了一个"提示"，关于应用程序是否应该恢复播放。

见下文:

    //Add notification observer
    __weak typeof(self) weakSelf = self;
    self.audioSessionInterruptionNotification =
    [[NSNotificationCenter defaultCenter] addObserverForName:AVAudioSessionInterruptionNotification
                                                      object:nil
                                                       queue:[NSOperationQueue mainQueue]
                                                  usingBlock:^(NSNotification *note) {
                                                      NSNumber* interruptionType = note.userInfo[AVAudioSessionInterruptionTypeKey];
                                                      NSNumber* interruptionOption = note.userInfo[AVAudioSessionInterruptionOptionKey];
                                                      BOOL shouldResume = interruptionOption.integerValue == AVAudioSessionInterruptionOptionShouldResume;
                                                      switch (interruptionType.integerValue) {
                                                          case AVAudioSessionInterruptionTypeBegan:
                                                              [weakSelf beginInterruption];
                                                              break;
                                                          case AVAudioSessionInterruptionTypeEnded:
                                                              [weakSelf endInterruption:shouldResume];
                                                              break;
                                                          default:
                                                              break;
                                                      }
                                                  }];
}