Iphone 目标C：在特定时间录制后自动播放

你好，你能帮我制作一个录音项目吗？在你用AVAudioRecorder录音后，它会在一定时间内自动播放。你能给我或给我一个关于我的问题的链接吗？我非常需要你的帮助，因为我是iOS开发的新手。提前谢谢各位。祝你今天愉快

这是我的代码@startrecording:

-(void)startRecording:(UIButton *)sender
{   //for recording

    recStopBtn.enabled=NO;
    recStopBtn.hidden = NO;
    recStopBtn.enabled =YES;
    playRecBtn.enabled = NO;
    loading.hidden = NO;
    [loading startAnimating];

    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;
    }

    recordSetting = [[NSMutableDictionary alloc] init];

    // We can use kAudioFormatAppleIMA4 (4:1 compression) or kAudioFormatLinearPCM for nocompression
    [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey];

    // We can use 44100, 32000, 24000, 16000 or 12000 depending on sound quality
    [recordSetting setValue:[NSNumber numberWithFloat:16000.0] forKey:AVSampleRateKey];

    // We can use 2(if using additional h/w) or 1 (iPhone only has one microphone)
    [recordSetting setValue:[NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];

    // These settings are used if we are using kAudioFormatLinearPCM format
    //[recordSetting setValue :[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
    //[recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
    //[recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];

    recorderFilePath = [NSString stringWithFormat:@"%@/MySound.caf", DOCUMENTS_FOLDER];



    NSLog(@"recorderFilePath: %@",recorderFilePath);

    NSURL *url = [NSURL fileURLWithPath:recorderFilePath];

    err = nil;

    NSData *audioData = [NSData dataWithContentsOfFile:[url path] options: 0 error:&err];
    if(audioData)
    {
        NSFileManager *fm = [NSFileManager defaultManager];
        [fm removeItemAtPath:[url path] error:&err];
    }

    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.inputIsAvailable;
    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 record];

    lblStatusMsg.text = @"Recording...";
    NSLog(@"RECORDING");
    //recIcon.image = [UIImage imageNamed:@"rec_icon.png"];
    //progressView.progress = 0.0;
    //timer = [NSTimer scheduledTimerWithTimeInterval:6.0 target:self selector:@selector(handleTimer) userInfo:nil repeats:YES];
}

---

如果您所需要的只是如何在一定时间后使事情发生，请使用

NSTimer

。我看到您的代码中已经注释掉了一个

要记录一定时间，请使用

recordForDuration

。要手动停止录制，请使用

stop

。要播放录音，请使用

AVAudioPlayer

方法

initWithContentsOfURL

中

AVAudioRecorder

的

url

属性

因此，基本上，取消注释您的

NSTimer

，然后执行以下操作

AVAudioPlayer *player;
- (void) handleTimer
{
    player = [[AVAudioPlayer alloc] initWithContentsOfURL:nameOfAudioRecorder.url];
}

---

这个问题主要要求为您编写代码。太宽了。请阅读常见问题解答，重新编写，然后返回给我们。@EricBrotto-很抱歉，先生。。我发布了我的代码。。。这是…如果你需要帮助，试着告诉我们你的代码现在做什么，以及你想让它做什么。如果您已经做了一些工作，并且只需要一些提示或疑难解答，您将得到最大的帮助。@Dustin我在这里发布的代码。。是为了我的开始记录行动。。。我想知道它是如何在特定时间后自动播放的。。