iOS 录音

前面 我们讲了 iOS下播放音效，播放音乐，这一节我们主要讲一下iOS录音功能

上一节地址：http://blog.youkuaiyun.com/lwjok2007/article/details/50425324

录音和播放音乐使用的是同一个框架，都是iOS系统提供的AVFoundation.framwork

首先，还是创建项目  

起名：TestAVFoundationRecorder

接下来 导入AVFoundation.framwork

具体操作参照上一节

完成后项目目录如下

打开项目默认生成ViewController.m 添加代码

导入头文件

#import <AVFoundation/AVFoundation.h>

创建变量

@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

初始化界面

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    _record=[[UIButton alloc]initWithFrame:CGRectMake(10, 300, 60, 36)];
    [_record setTitle:@"录音" forState:UIControlStateNormal];
    [_record setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [_record addTarget:self action:@selector(recordClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_record];
    
    _pause=[[UIButton alloc]initWithFrame:CGRectMake(80, 300, 60, 36)];
    [_pause setTitle:@"暂停" forState:UIControlStateNormal];
    [_pause setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [_pause addTarget:self action:@selector(pauseClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_pause];
    
    _resume=[[UIButton alloc]initWithFrame:CGRectMake(150, 300, 60, 36)];
    [_resume setTitle:@"恢复" forState:UIControlStateNormal];
    [_resume setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [_resume addTarget:self action:@selector(resumeClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_resume];
    
    _stop=[[UIButton alloc]initWithFrame:CGRectMake(220, 300, 60, 36)];
    [_stop setTitle:@"停止" forState:UIControlStateNormal];
    [_stop setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [_stop addTarget:self action:@selector(stopClick:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_stop];
    
    
    _audioPower= [[UIProgressView alloc] initWithProgressViewStyle: UIProgressViewStyleDefault];
    _audioPower.frame=CGRectMake(0, 100, self.view.bounds.size.width, 36);
    [self.view addSubview:_audioPower];
    
    [self setAudioSession];
}

创建一个常量作为录音文件的名称

#define kRecordAudioFile @"myRecord.caf"

最后我们实现一下 个个按钮点击之后的动作  以及录音等等 

#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];
    
    NSFileManager *fileManager = [NSFileManager defaultManager];
    
    
    if(![fileManager fileExistsAtPath:urlStr]) //如果不存在
        
    {
        NSLog(@"xxx.txt is not exist");
    }else{
        NSLog(@"xxx.txt is  exist");
    }
    
    
    urlStr=[urlStr stringByAppendingPathComponent:kRecordAudioFile];
    NSLog(@"file path:%@",urlStr);
    NSURL *url=[NSURL fileURLWithPath:urlStr];
    return url;
}

///var/mobile/Applications/F0CCA9DC-FFBE-4701-8396-2E6EB9509292/Documents/myRecord.caf
///var/mobile/Applications/F0CCA9DC-FFBE-4701-8396-2E6EB9509292/Documents/myRecord.caf
/**
 *  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 power= [self.audioRecorder averagePowerForChannel:0];//取得第一个通道的音频，注意音频强度范围时-160到0
    CGFloat progress=(1.0/160.0)*(power+160.0);
    [self.audioPower setProgress:progress];
}

#pragma mark - UI事件
/**
 *  点击录音按钮
 *
 *  @param sender 录音按钮
 */

- (void)recordClick:(UIButton *)sender {
//    if (![self.audioPlayer isPlaying]) {
//        [self.audioPlayer play];
//    }
//
    if (![self.audioRecorder isRecording]) {
        [self.audioRecorder record];//首次使用应用时如果调用record方法会询问用户是否允许使用麦克风
        self.timer.fireDate=[NSDate distantPast];
    }
}

/**
 *  点击暂定按钮
 *
 *  @param sender 暂停按钮
 */
- (void)pauseClick:(UIButton *)sender {
    if ([self.audioRecorder isRecording]) {
        [self.audioRecorder pause];
        self.timer.fireDate=[NSDate distantFuture];
    }
}

/**
 *  点击恢复按钮
 *  恢复录音只需要再次调用record，AVAudioSession会帮助你记录上次录音位置并追加录音
 *
 *  @param sender 恢复按钮
 */
- (void)resumeClick:(UIButton *)sender {
    [self recordClick:sender];
}

/**
 *  点击停止按钮
 *
 *  @param sender 停止按钮
 */
- (void)stopClick:(UIButton *)sender {
    [self.audioRecorder stop];
    self.timer.fireDate=[NSDate distantFuture];
    self.audioPower.progress=0.0;
}

#pragma mark - 录音机代理方法
/**
 *  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{
    if (![self.audioPlayer isPlaying]) {
        [self.audioPlayer play];
    }
    NSLog(@"录音完成!");
}

到此 我们基本实现了功能

运行项目看看 

点击录音 看看 是不是 可以是用来 。点击停止之后录音结束并且自动开发播放录音

项目代码我们会上传群空间【51230AVFoundationRecorder.zip】 

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