iOS play audio success on simulator but fail on device

Question

I use audio recorder to record and create file in the document directory, then I play it using audio player. I am able to record it on both simulator and device, but I can't play it on device only.

Notice that 1. I don't play sound from files, I play from NSData (I store music into database, and retrieve them to play) 2. It works fine on simulator but failed on device.

Here is my code for playing audio

- (void)playAudioWithData:(NSData *)data {

    [self stopPlayingAudio];
    [self stopRecordingAudio];


    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
    [audioSession setActive:YES error:nil];


    self.audioPlayer = [[AVAudioPlayer alloc] initWithData:data error:nil];

    [self.audioPlayer play];

}

this is the setting for recording:

    NSDictionary *audioSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                   [NSNumber numberWithFloat:44100],AVSampleRateKey,
                                   [NSNumber numberWithInt: kAudioFormatLinearPCM],AVFormatIDKey,
                                   [NSNumber numberWithInt: 1],AVNumberOfChannelsKey,
                                   [NSNumber numberWithInt:AVAudioQualityMedium],AVEncoderAudioQualityKey,nil];

Answer 1

Instead of using AVAudioSessionCategoryPlayAndRecord try setting the audio session to AVAudioSessionCategoryRecord when recording and then to AVAudioSessionCategoryPlayback when you want to play back what you just recorded.

I experienced the same thing in my app when recording and playing back audio and this resolved the issue.