- (void)viewDidLoad {
    [super viewDidLoad];
    NSArray *dirPath=NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);
    NSString *docPath=[dirPath objectAtIndex:0];
    NSString *filePath=[docPath stringByAppendingPathComponent:@"test1.wav"];
    _url=[NSURL URLWithString:filePath];

    NSDictionary *recordSettings=[NSDictionary dictionaryWithObjectsAndKeys:
          [NSNumber numberWithInt:AVAudioQualityMin],
          AVEncoderAudioQualityKey,
          [NSNumber numberWithInt:16],
          AVEncoderBitRateKey,
          [NSNumber numberWithInt:2],
          AVNumberOfChannelsKey,
          [NSNumber numberWithFloat:44100.0],
          AVSampleRateKey,
          nil];
    NSError *error;
    //AVAudioRecorder *recorder;
    //AVAudioPlayer *player;

    _player=[[AVAudioPlayer alloc] initWithContentsOfURL:_url error:&error];
    _recorder=[[AVAudioRecorder alloc] initWithURL:_url settings:recordSettings error:nil];
    if (error) {
        NSLog(@"%@",[error localizedDescription]);
    }else{
        [_recorder prepareToRecord];
    }
}

调试的时候显示_player的值为nil，还有报错： The operation couldn’t be completed. (OSStatus error 2003334207.)我没在网上找到答案。