調用iOS Sleep Timer時如何停止音頻

Question

我想在iOS睡眠計時器被調用時停止我的音頻應用程序。

就像Pandora應用一樣。
http://help.pandora.com/customer/portal/articles/24324-ios-sleep-timer-with-pandora

點按“時鍾”應用程序，點按“計時器”，選擇一個時間，點按“計時器結束時”，點按“停止播放”

如果Pandora應用程序正在運行，它將使其休眠。

我可以看到inInterruptionState == kAudioSessionBeginInterruption在iOS睡眠計時器結束時被調用，但是如何檢測它是睡眠計時器還是僅僅是像電話這樣的中斷？

這是我的代碼。 目前，我的應用只是在iOS睡眠計時器結束后才重新開始播放。

// 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

訣竅不是要檢測中斷源，而是要知道您的應用在中斷后是否應繼續運行。

音頻會話中斷時，AVAudioSession API將發送通知。 在此通知中，操作系統會“提示”應用程序是否應繼續播放。

見下文：

    //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;
                                                      }
                                                  }];
}