AVAudioRecorder录制的音频用AVAudioPlayer播放出来声音很小

 1  
 2  NSError *playerError;
 3         
 4         player = [[AVAudioPlayer alloc] initWithContentsOfURL:recordedFile error:&playerError];
 5 
 6 
 7 //在前面加上
 8 AVAudioSession *audioSession = [AVAudioSession sharedInstance];
 9 NSError *err = nil;
10 [audioSession setCategory :AVAudioSessionCategoryPlayback error:&err];
11 //弄好了，在播放前这样就可以了