iOS 录音实现

需求

某处功能加上录音功能，时间大概60秒，上传到服务器，服务器要求文件大小控制在1M以内。

实现思路

利用系统框架AVFoundation实现录音和录音播放

实现步骤

一. 添加AVFoundation

二. 在需要的文件导入AVFoundation

#import <AVFoundation/AVFoundation.h>

三.核心代码

＊ 开始录音

- (IBAction)startRecord:(id)sender {
    NSLog(@"开始录音");

    countDown = 60;
    [self addTimer];
    
    AVAudioSession *session =[AVAudioSession sharedInstance];
    NSError *sessionError;
    [session setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError];
    
    if (session == nil) {
        
        NSLog(@"Error creating session: %@",[sessionError description]);
        
    }else{
        [session setActive:YES error:nil];
        
    }
    
    self.session = session;
    
    
    //1.获取沙盒地址
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    filePath = [path stringByAppendingString:@"/RRecord.wav"];
    
    //2.获取文件路径
    self.recordFileUrl = [NSURL fileURLWithPath:filePath];
    
    //设置参数
    NSDictionary *recordSetting = [[NSDictionary alloc] initWithObjectsAndKeys:
                                     //采样率  8000/11025/22050/44100/96000（影响音频的质量）
                                   [NSNumber numberWithFloat: 8000.0],AVSampleRateKey,
                                   // 音频格式
                                   [NSNumber numberWithInt: kAudioFormatLinearPCM],AVFormatIDKey,
                                   //采样位数  8、16、24、32 默认为16
                                   [NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,
                                   // 音频通道数 1 或 2
                                   [NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
                                   //录音质量
                                   [NSNumber numberWithInt:AVAudioQualityHigh],AVEncoderAudioQualityKey,
                                   nil];

    
    _recorder = [[AVAudioRecorder alloc] initWithURL:self.recordFileUrl settings:recordSetting error:nil];
    
    if (_recorder) {
        
        _recorder.meteringEnabled = YES;
        [_recorder prepareToRecord];
        [_recorder record];
        
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(60 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            
            [self stopRecord:nil];
        });
        
        
        
    }else{
        NSLog(@"音频格式和文件存储格式不匹配,无法初始化Recorder");
        
    }
    



}

＊停止录音

- (IBAction)stopRecord:(id)sender {

   [self removeTimer];
    NSLog(@"停止录音");
    
    if ([self.recorder isRecording]) {
        [self.recorder stop];
    }
    
    
    NSFileManager *manager = [NSFileManager defaultManager];
    if ([manager fileExistsAtPath:filePath]){
        
        _noticeLabel.text = [NSString stringWithFormat:@"录了 %ld 秒,文件大小为 %.2fKb",COUNTDOWN - (long)countDown,[[manager attributesOfItemAtPath:filePath error:nil] fileSize]/1024.0];
        
    }else{
    
        _noticeLabel.text = @"最多录60秒";

    }
    


}

＊播放录音

- (IBAction)PlayRecord:(id)sender {
    
    NSLog(@"播放录音");
    [self.recorder stop];
    
    if ([self.player isPlaying])return;
    
    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:self.recordFileUrl error:nil];
    
    
    
    NSLog(@"%li",self.player.data.length/1024);
    
   
    
    [self.session setCategory:AVAudioSessionCategoryPlayback error:nil];
    [self.player play];
    

    
    
}

demo地址：https://github.com/Rachel829/RLAudioRecord
效果图：