使用AVAudioPlayer播放背景声音序列
我想用AVAudioPlayer播放声音序列。 前景都很好，但在后台我有问题。
在安排下一个声音后，它会在后台播放，但下一个声音初始化失败。
如何解决这个问题？
事实上，我有一系列的声音和起始时刻的序列。 当用户触摸按钮应用程序开始播放声音。
我使用以下代码：
- (void)soundScheduleNext { NSURL * url = ...; // get url of next sound file if (soundPlayer == nil) soundPlayer = [AVAudioPlayer alloc]; soundPlayer = [soundPlayer initWithContentsOfURL:url error:nil]; soundPlayer.delegate = self; AVAudioSession * audioSession = [AVAudioSession sharedInstance]; [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil]; // if this is a first element of sound sequence... if (soundSeqNext == 0) { // ... play right now [soundPlayer prepareToPlay]; soundStartMoment = [soundPlayer deviceCurrentTime]; [soundPlayer play]; } else { BOOL prepareToPlayOk = [soundPlayer prepareToPlay]; // when second element of sequence play - prepareToPlayOk is YES; when third - prepareToPlayOk is NO :( NSLog(@"soundScheduleNext: prepareToPlayOk = %d", (int)prepareToPlayOk, nil); NSTimeInterval timeMoment = ... ; // get moment of time for next sound [soundPlayer playAtTime:timeMoment]; } soundSeqNext++; } - (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag { [self soundScheduleNext]; }
每次声音播放结束后，都会调用audioPlayerDidFinishPlaying函数。
音频会话设置类别后面的以下行解决了问题：
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
有关详细信息， 请访问https://stackoverflow.com/a/8071865/13441