iOS 录音功能的实现

1.初始化录音设置

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AVAudioSession * session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[session setActive:YES error:nil];
//录音设置
NSMutableDictionary * recordSetting = [[NSMutableDictionary alloc]init];
//设置录音格式
[recordSetting  setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
//设置录音采样率（HZ）
[recordSetting setValue:[NSNumber numberWithFloat:4000] forKey:AVSampleRateKey];
//录音通道数
[recordSetting setValue:[NSNumber  numberWithInt:1] forKey:AVNumberOfChannelsKey];
//线性采样位数
[recordSetting  setValue:[NSNumber numberWithInt:8] forKey:AVLinearPCMBitDepthKey];
//录音的质量
[recordSetting  setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey]; 
//获取沙盒路径 作为存储录音文件的路径
NSString * strUrl = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject];
NSLog(@"path = %@",strUrl);
//创建url
NSURL * url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/voice.aac",strUrl]];
self.urlPlay = url;
NSError * error ;
//初始化AVAudioRecorder
self.recorder = [[AVAudioRecorder alloc]initWithURL:url settings:recordSetting error:&error];
//开启音量监测
self.recorder.meteringEnabled = YES;
self.recorder.delegate = self;
if(error){
    NSLog(@"创建录音对象时发生错误，错误信息：%@",error.localizedDescription);
}

2.开始录音

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if([_recorder prepareToRecord]){
        //开始
        [_recorder record];
        NSLog(@"开始录音");
    }

3.录音结束

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//获取当前录音时长
    float voiceSize = self.recorder.currentTime;
    
    NSLog(@"录音时长 = %f",voiceSize);
    
    if(voiceSize < 3){
        [self.recorder deleteRecording];
        UIAlertView * altView = [[UIAlertView alloc]initWithTitle:nil
                                                          message:@"时长小于3秒，重新录制" delegate:self cancelButtonTitle:nil otherButtonTitles: nil];
        [altView show];
        
        [self performSelector:@selector(performDismiss:) withObject:altView afterDelay:1.5];
        
    }else if (voiceSize > 60){
        
        [self.recorder deleteRecording];
        UIAlertView * altView = [[UIAlertView alloc]initWithTitle:nil
                                                          message:@"时长大于1分钟，重新录制" delegate:self cancelButtonTitle:nil otherButtonTitles: nil];
        [altView show];
        
        [self performSelector:@selector(performDismiss:) withObject:altView afterDelay:1.5];
    }
    
    [self.recorder stop];