AVAudioRecorder、AVAudioPlayer录音及播放

#pragma mark -  设置录制的音频文件的位置
- (NSString *)audioRecordingPath{
    NSString *str_date=[TimeTransform DateToStringWithFormat:[NSDate date] withFormatString:@"yyyyMMDDHHmmss"];
    AvdioName=str_date;
    NSString *result = nil;
    NSArray *folders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsFolde = [folders objectAtIndex:0];
    result = [documentsFolde stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.aac",str_date]];
    return (result);
}

#pragma mark -根据文件名获取文件路径
-(NSString *)getRecordingPathWithName:(NSString *)name{
    NSArray *folders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsFolde = [folders objectAtIndex:0];
    NSString *result = nil;
    result = [documentsFolde stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.aac",name]];
    return result;
}

#pragma mark -录音按钮
-(void)SoundAction:(UILongPressGestureRecognizer *)gestureRecognizer{

    if (gestureRecognizer.state==UIGestureRecognizerStateBegan) {
        NSLog(@"UIGestureRecognizerStateBegan");

        //按下录音
        if ([self canRecord]) {

            NSError *error = nil;
            //必须真机上测试,模拟器上可能会崩溃
            recorder = [[AVAudioRecorder alloc] initWithURL:[NSURL URLWithString:[self audioRecordingPath]] settings:recorderSettingsDict error:&error];

            if (recorder) {
                recorder.meteringEnabled = YES;
                [recorder prepareToRecord];
                [recorder record];

                //启动定时器
                timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(levelTimer:) userInfo:nil repeats:YES];
                NSLog(@"录制声音开始！");

                [self performSelector:@selector(stopRecordingOnAudioRecorder:)
                           withObject:recorder
                           afterDelay:10.0f];
                [view_black_bg setHidden:false];
            } else
            {
                int errorCode = CFSwapInt32HostToBig ([error code]);
                NSLog(@"Error: %@ [%4.4s])" , [error localizedDescription], (char*)&errorCode);

            }
        }

    }else if (gestureRecognizer.state==UIGestureRecognizerStateEnded){
        NSLog(@"UIGestureRecognizerStateEnded");
        [lb_audio_title setText:AvdioName];
        [self stopRecordingOnAudioRecorder:recorder];
        [timer invalidate];
        [view_black_bg setHidden:YES];
    }
}

-(void)levelTimer:(NSTimer*)timer_
{
    //call to refresh meter values刷新平均和峰值功率,此计数是以对数刻度计量的,-160表示完全安静，0表示最大输入值
    [recorder updateMeters];
    const double ALPHAa = 0.05;
    double peakPowerForChannel = pow(10, (0.05 * [recorder peakPowerForChannel:0]));
    lowPassResults = ALPHAa * peakPowerForChannel + (1.0 - ALPHAa) * lowPassResults;

    NSLog(@"Average input: %f Peak input: %f Low pass results: %f", [recorder averagePowerForChannel:0], [recorder peakPowerForChannel:0], lowPassResults);

//    if (lowPassResults>=0.8) {
//        soundLodingImageView.image = [UIImage imageNamed:[volumImages objectAtIndex:7]];
//    }else if(lowPassResults>=0.7){
//        soundLodingImageView.image = [UIImage imageNamed:[volumImages objectAtIndex:6]];
//    }else if(lowPassResults>=0.6){
//        soundLodingImageView.image = [UIImage imageNamed:[volumImages objectAtIndex:5]];
//    }else if(lowPassResults>=0.5){
//        soundLodingImageView.image = [UIImage imageNamed:[volumImages objectAtIndex:4]];
//    }else if(lowPassResults>=0.4){
//        soundLodingImageView.image = [UIImage imageNamed:[volumImages objectAtIndex:3]];
//    }else if(lowPassResults>=0.3){
//        soundLodingImageView.image = [UIImage imageNamed:[volumImages objectAtIndex:2]];
//    }else if(lowPassResults>=0.2){
//        soundLodingImageView.image = [UIImage imageNamed:[volumImages objectAtIndex:1]];
//    }else if(lowPassResults>=0.1){
//        soundLodingImageView.image = [UIImage imageNamed:[volumImages objectAtIndex:0]];
//    }else{
//        soundLodingImageView.image = [UIImage imageNamed:[volumImages objectAtIndex:0]];
//    }

}

//判断是否允许使用麦克风7.0新增的方法requestRecordPermission
-(BOOL)canRecord
{
    __block BOOL bCanRecord = YES;
    if ([[[UIDevice currentDevice] systemVersion] compare:@"7.0"] != NSOrderedAscending)
    {
        AVAudioSession *audioSession = [AVAudioSession sharedInstance];
        if ([audioSession respondsToSelector:@selector(requestRecordPermission:)]) {
            [audioSession performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {
                if (granted) {
                    bCanRecord = YES;
                }
                else {
                    bCanRecord = NO;
                    dispatch_async(dispatch_get_main_queue(), ^{
                        [[[UIAlertView alloc] initWithTitle:nil
                                                    message:@"app需要访问您的麦克风。\n请启用麦克风-设置/隐私/麦克风"
                                                   delegate:nil
                                          cancelButtonTitle:@"关闭"
                                          otherButtonTitles:nil] show];
                    });
                }
            }];
        }
    }

    return bCanRecord;
}

#pragma mark -停止音频的录制
- (void)stopRecordingOnAudioRecorder:(AVAudioRecorder *)record{

    [recorder stop];
    recorder=nil;

    //结束定时器
    [timer invalidate];
    timer = nil;
}
/**
 *  录音完成，录音完成后播放录音
 *
 *  @param recorder 录音机对象
 *  @param flag     是否成功
 */
-(void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag{

}