Iphone 声音在设备中不工作

在我的应用程序中，我为记录而写

    NSArray *filePaths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *recordingDirectory = [filePaths objectAtIndex: 0];
    NSString *resourcePath = [recordingDirectory  stringByAppendingString:@"/sound.caf"];
    self.soundFileURL = [NSURL fileURLWithPath:resourcePath];


 AVAudioSession *audioSession = [AVAudioSession sharedInstance];

 audioSession.delegate = self;

 [audioSession setActive: YES error: nil];

 [[AVAudioSession sharedInstance] setCategory : AVAudioSessionCategoryRecorderror: nil];

 NSDictionary *recordSettings =

 [[NSDictionary alloc] initWithObjectsAndKeys:

  [NSNumber numberWithFloat: 44100.0],                 AVSampleRateKey,

  [NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey,

  [NSNumber numberWithInt: 1],                         AVNumberOfChannelsKey,

  [NSNumber numberWithInt: AVAudioQualityMax],         AVEncoderAudioQualityKey,

  nil];


AVAudioRecorder *newRecorder = [[AVAudioRecorder alloc] initWithURL: soundFileURL settings: recordSettings error: nil];

 [recordSettings release];

 self.soundRecorder = newRecorder;

 [newRecorder release];



 soundRecorder.delegate = self;

 [soundRecorder prepareToRecord];

 [soundRecorder record];



recording = YES;

我为停止录音而写作

 [soundRecorder stop];

recording = NO;

self.soundRecorder = nil;

我写游戏按钮

 AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: self.soundFileURL  error: nil];

 [fileURL release];

 self.player = newPlayer;

 [newPlayer release];

 [player prepareToPlay];

 [player setDelegate: self];

    [button setTitle : @"Pause"forState: UIControlStateHighlighted];

    [button setTitle : @"Pause"forState: UIControlStateNormal];

    [player play];

在iPhone模拟器中一切正常

我先录制，然后停止播放，一切正常

但在我的iPhone设备中没有声音。

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任何帮助都将得到极大的感谢

我也遇到过类似的问题。然后我将AudioSession类别设置为播放：

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

希望这能有所帮助