IOS-录音功能

初始化AVAudioRecorder并设置录音的参数和存储地址：

[cpp]
//录音设置
    NSMutableDictionary *recordSetting = [[[NSMutableDictionary alloc]init] autorelease];
    //设置录音格式 AVFormatIDKey==kAudioFormatLinearPCM
    [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
    //设置录音采样率(Hz) 如：AVSampleRateKey==8000/44100/96000（影响音频的质量）
    [recordSetting setValue:[NSNumber numberWithFloat:44100] forKey:AVSampleRateKey];
    //录音通道数 1 或 2
    [recordSetting setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];
    //线性采样位数 8、16、24、32
    [recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
    //录音的质量
    [recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];

    NSString *strUrl = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/lll.aac", strUrl]];
    urlPlay = url;

    NSError *error;
    //初始化
    recorder = [[AVAudioRecorder alloc]initWithURL:url settings:recordSetting error:&error];
    //开启音量检测
    recorder.meteringEnabled = YES;
    recorder.delegate = self;

//录音设置
    NSMutableDictionary *recordSetting = [[[NSMutableDictionary alloc]init] autorelease];
    //设置录音格式 AVFormatIDKey==kAudioFormatLinearPCM
    [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
    //设置录音采样率(Hz) 如：AVSampleRateKey==8000/44100/96000（影响音频的质量）
    [recordSetting setValue:[NSNumber numberWithFloat:44100] forKey:AVSampleRateKey];
    //录音通道数 1 或 2
    [recordSetting setValue:[NSNumber numberWithInt:1] forKey:AVNumberOfChannelsKey];
    //线性采样位数 8、16、24、32
    [recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
    //录音的质量
    [recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];

    NSString *strUrl = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/lll.aac", strUrl]];
    urlPlay = url;

    NSError *error;
    //初始化
    recorder = [[AVAudioRecorder alloc]initWithURL:url settings:recordSetting error:&error];
    //开启音量检测
    recorder.meteringEnabled = YES;
    recorder.delegate = self;

识别音量的大小，从而显示不同的图片，来呈现出音量图波动

[cpp]
[recorder updateMeters];//刷新音量数据
    //获取音量的平均值 [recorder averagePowerForChannel:0];
    //音量的最大值 [recorder peakPowerForChannel:0];

    double lowPassResults = pow(10, (0.05 * [recorder peakPowerForChannel:0]));
    NSLog(@"%lf",lowPassResults);
    //最大50 0
    //图片小-》大
    if (0<lowPassResults<=0.06) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_01.png"]];
    }else if (0.06<lowPassResults<=0.13) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_02.png"]];
    }else if (0.13<lowPassResults<=0.20) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_03.png"]];
    }else if (0.20<lowPassResults<=0.27) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_04.png"]];
    }else if (0.27<lowPassResults<=0.34) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_05.png"]];
    }else if (0.34<lowPassResults<=0.41) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_06.png"]];
    }else if (0.41<lowPassResults<=0.48) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_07.png"]];
    }else if (0.48<lowPassResults<=0.55) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_08.png"]];
    }else if (0.55<lowPassResults<=0.62) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_09.png"]];
    }else if (0.62<lowPassResults<=0.69) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_10.png"]];
    }else if (0.69<lowPassResults<=0.76) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_11.png"]];
    }else if (0.76<lowPassResults<=0.83) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_12.png"]];
    }else if (0.83<lowPassResults<=0.9) {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_13.png"]];
    }else {
        [self.imageView setImage:[UIImage imageNamed:@"record_animate_14.png"]];
    }

[recorder updateMeters];//刷新音量数据
    //获取音量的平均值 [recorder averagePowerForChannel:0];
    //音量的最大值 [recorder peakPowerForChannel:0];

    double lowPassResults = pow(10, (0.05 * [recorder peakPowerForChannel:0]));
    NSLog(@"%lf",lowPassResults);
    //最大50 0
    //图片小-》大
    if (0<lowPassResults<=0.06) {
        [self.imageView setImage:[UIImage imag

补充：移动开发 , IOS ,