录音

#import "RecordViewController.h"
#import 
#define kRecordAudioFile @"myRecord.caf"

@interface RecordViewController ()
@property (nonatomic,strong) AVAudioRecorder *audioRecorder;//音频录音机
@property (nonatomic,strong) AVAudioPlayer *audioPlayer;//音频播放器，用于播放录音文件
@property (nonatomic,strong) NSTimer *timer;//录音声波监控（注意这里暂时不对播放进行监控）

@property (strong, nonatomic) UIButton *record;//开始录音
@property (strong, nonatomic) UIButton *pause;//暂停录音
@property (strong, nonatomic) UIButton *resume;//恢复录音
@property (strong, nonatomic) UIButton *stop;//停止录音
@property (strong, nonatomic) UIProgressView *audioPower;//音频波动
@end

@implementation RecordViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self createSub];
    [self setAudioSession];
}

- (void)createSub {
    //录音
    self.record = [UIButton buttonWithType:UIButtonTypeSystem];
    self.record.frame = CGRectMake(10, 500, 60, 40);
    self.record.backgroundColor = [UIColor orangeColor];
    [self.record setTitle:@"录音" forState:UIControlStateNormal];
    [self.record addTarget:self action:@selector(record:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.record];
    //暂停
    self.pause = [UIButton buttonWithType:UIButtonTypeSystem];
    self.pause.frame = CGRectMake(80, 500, 60, 40);
    self.pause.backgroundColor = [UIColor orangeColor];
    [self.pause setTitle:@"暂停" forState:UIControlStateNormal];
    [self.pause addTarget:self action:@selector(pause:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.pause];
    //回复
    self.resume = [UIButton buttonWithType:UIButtonTypeSystem];
    self.resume.frame = CGRectMake(150, 500, 60, 40);
    self.resume.backgroundColor = [UIColor orangeColor];
    [self.resume setTitle:@"恢复" forState:UIControlStateNormal];
    [self.resume addTarget:self action:@selector(resume:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.resume];
    //停止
    self.stop = [UIButton buttonWithType:UIButtonTypeSystem];
    self.stop.frame = CGRectMake(220, 500, 60, 40);
    self.stop.backgroundColor = [UIColor orangeColor];
    [self.stop setTitle:@"停止" forState:UIControlStateNormal];
    [self.stop addTarget:self action:@selector(stop:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.stop];
    
    self.audioPower = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
    self.audioPower.frame = CGRectMake(20, 200, 100, 5);
    self.audioPower.progressTintColor = [UIColor orangeColor];
    self.audioPower.trackTintColor = [UIColor blueColor];
    [self.view addSubview:self.audioPower];
    
}

#pragma mark - 私有方法
/**
 *  设置音频会话
 */
-(void)setAudioSession{
    AVAudioSession *audioSession=[AVAudioSession sharedInstance];
    //设置为播放和录音状态，以便可以在录制完之后播放录音
    [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
    [audioSession setActive:YES error:nil];
}

/**
 *  取得录音文件保存路径
 *
 *  @return 录音文件路径
 */
-(NSURL *)getSavePath{
    NSString *urlStr=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    urlStr=[urlStr stringByAppendingPathComponent:kRecordAudioFile];
    NSLog(@"file path:%@",urlStr);
    NSURL *url=[NSURL fileURLWithPath:urlStr];
    return url;
}

/**
 *  取得录音文件设置
 *
 *  @return 录音设置
 */
-(NSDictionary *)getAudioSetting{
    NSMutableDictionary *dicM=[NSMutableDictionary dictionary];
    //设置录音格式
    [dicM setObject:@(kAudioFormatLinearPCM) forKey:AVFormatIDKey];
    //设置录音采样率，8000是电话采样率，对于一般录音已经够了
    [dicM setObject:@(8000) forKey:AVSampleRateKey];
    //设置通道,这里采用单声道
    [dicM setObject:@(1) forKey:AVNumberOfChannelsKey];
    //每个采样点位数,分为8、16、24、32
    [dicM setObject:@(8) forKey:AVLinearPCMBitDepthKey];
    //是否使用浮点数采样
    [dicM setObject:@(YES) forKey:AVLinearPCMIsFloatKey];
    //....其他设置等
    return dicM;
}

/**
 *  获得录音机对象
 *
 *  @return 录音机对象
 */
-(AVAudioRecorder *)audioRecorder{
    if (!_audioRecorder) {
        //创建录音文件保存路径
        NSURL *url = [self getSavePath];
        //创建录音格式设置
        NSDictionary *setting = [self getAudioSetting];
        //创建录音机
        NSError *error = nil;
        _audioRecorder=[[AVAudioRecorder alloc]initWithURL:url settings:setting error:&error];
        _audioRecorder.delegate = self;
        _audioRecorder.meteringEnabled=YES;//如果要监控声波则必须设置为YES
        if (error) {
            NSLog(@"创建录音机对象时发生错误，错误信息：%@",error.localizedDescription);
            return nil;
        }
    }
    return _audioRecorder;
}


/**
 *  创建播放器
 *
 *  @return 播放器
 */
-(AVAudioPlayer *)audioPlayer{
    if (!_audioPlayer) {
        NSURL *url = [self getSavePath];
        NSError *error=nil;
        _audioPlayer=[[AVAudioPlayer alloc]initWithContentsOfURL:url error:&error];
        _audioPlayer.numberOfLoops=0;
        [_audioPlayer prepareToPlay];
        if (error) {
            NSLog(@"创建播放器过程中发生错误，错误信息：%@",error.localizedDescription);
            return nil;
        }
    }
    return _audioPlayer;
}


/**
 *  录音声波监控定制器
 *
 *  @return 定时器
 */
-(NSTimer *)timer{
    if (!_timer) {
        _timer=[NSTimer scheduledTimerWithTimeInterval:0.1f target:self selector:@selector(audioPowerChange) userInfo:nil repeats:YES];
    }
    return _timer;
}

/**
 *  录音声波状态设置
 */
-(void)audioPowerChange{
    [self.audioRecorder updateMeters];//更新测量值
    float lowPassResults = pow(10, (0.05 * [self.audioRecorder peakPowerForChannel:0]));
    NSLog(@"%.2f", lowPassResults);
    
    CGFloat pro = 0;
    if (0