iOS - 录制音频和播放

Question

我正在尝试编写一个应用程序，允许我录制一条消息，然后让用户播放他们录制的内容，但由于某种原因，此代码无法正常工作。当playAction方法被调用时，我什么也听不到，只有死气。有任何想法吗？

- (void) playAction 
{ 
    NSLog(@"PlaY action"); 

    NSError *error; 
    AVAudioPlayer *player = [[AVAudioPlayer alloc] 
            initWithContentsOfURL:[NSURL fileURLWithPath:recorderFilePath] error:&error]; 
// AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithData:self.audioData error:&error]; 
    [player prepareToPlay]; 
    [player play]; 

} 
- (void) startRecording 
{ 
    [self.timer fire]; 
    self.recordButton.userInteractionEnabled = NO; 
    self.stopButton.hidden = NO; 
    self.playButton.hidden = YES; 

    self.counterLabel.hidden = NO; 
    self.viewTitle.hidden = YES; 
    self.shortBlurb.hidden = YES; 

    AVAudioSession *audioSession = [AVAudioSession sharedInstance]; 
    NSError *err = nil; 
    [audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err]; 
    if(err){ 
     NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]); 
     return; 
    } 
    [audioSession setActive:YES error:&err]; 
    err = nil; 
    if(err){ 
     NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]); 
     return; 
    } 

    NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init]; 

    [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey]; 
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; 
    [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey]; 

    [recordSetting setValue :[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey]; 
    [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey]; 
    [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey]; 

    // Create a new dated file 
    NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0]; 
    NSString *caldate = [now description]; 
    recorderFilePath = [NSString stringWithFormat:@"%@/%@.caf", DOCUMENTS_FOLDER, caldate]; 

    NSURL *url = [NSURL fileURLWithPath:recorderFilePath]; 
    err = nil; 
    recorder = [[ AVAudioRecorder alloc] initWithURL:url settings:recordSetting error:&err]; 
    if(!recorder){ 
     NSLog(@"recorder: %@ %d %@", [err domain], [err code], [[err userInfo] description]); 
     UIAlertView *alert = 
     [[UIAlertView alloc] initWithTitle: @"Warning" 
            message: [err localizedDescription] 
            delegate: nil 
         cancelButtonTitle:@"OK" 
         otherButtonTitles:nil]; 
     [alert show]; 
     return; 
    } 

    //prepare to record 
    [recorder setDelegate:self]; 
    [recorder prepareToRecord]; 
    recorder.meteringEnabled = YES; 

    BOOL audioHWAvailable = audioSession.inputAvailable; 
    if (! audioHWAvailable) { 
     UIAlertView *cantRecordAlert = 
     [[UIAlertView alloc] initWithTitle: @"Warning" 
            message: @"Audio input hardware not available" 
            delegate: nil 
         cancelButtonTitle:@"OK" 
         otherButtonTitles:nil]; 
     [cantRecordAlert show]; 
     return; 
    } 

    // start recording 
    [recorder recordForDuration:(NSTimeInterval) 7]; 
} 

- (void) stopRecording{ 

    self.counterLabel.hidden = YES; 
    self.recordButton.userInteractionEnabled = YES; 

    self.viewTitle.hidden = NO; 
    self.shortBlurb.hidden = NO; 

    self.recordButton.hidden = NO; 
    self.playButton.hidden = NO; 
    self.stopButton.hidden = YES; 

    [recorder stop]; 

    NSURL *url = [NSURL fileURLWithPath: recorderFilePath]; 
    NSError *err = nil; 
    self.audioData = [NSData dataWithContentsOfFile:[url path] options: 0 error:&err]; 
    if(!audioData) 
    { 
     NSLog(@"audio data: %@ %d %@", [err domain], [err code], [[err userInfo] description]); 
    } 
    //[editedObject setValue:[NSData dataWithContentsOfURL:url] forKey:editedFieldKey]; 

    //[recorder deleteRecording]; 


    NSFileManager *fm = [NSFileManager defaultManager]; 

    err = nil; 
    //[fm removeItemAtPath:[url path] error:&err]; 
    if(err) 
     NSLog(@"File Manager: %@ %d %@", [err domain], [err code], [[err userInfo] description]); 
} 

- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *) aRecorder successfully:(BOOL)flag 
{ 

    NSLog (@"audioRecorderDidFinishRecording:successfully:"); 
    // your actions here 

} 

Answer 1

它看起来好像没什么问题，除了：

尝试修改此：

AVAudioPlayer *player = [[AVAudioPlayer alloc]... 

到：

@property(nonatomic, strong) AVAudioPlayer *player; 

self.player = [[AVAudioPlayer alloc]..... 

希望这有助于。