iOS - 录音和播放

利用系统框架AVFoundation实现录音和录音播放

1,导入头文件

#import <AVFoundation/AVFoundation.h>

2,申请麦克风权限NSMicrophoneUsageDescription

3，属性定义

@property (nonatomic, strong) AVAudioRecorder * audioRecorder;//录音器

@property (nonatomic, strong) AVAudioPlayer *player; //播放器
@property (nonatomic, strong) NSURL *recordFileUrl; //文件地址
-(AVAudioRecorder *)audioRecorder
{
    if (!_audioRecorder) {
        // 1. 确定录音存放的位置
        NSString *path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"text.caf"];
        NSURL *url = [NSURL URLWithString:path];


        // 2. 设置录音参数
        NSMutableDictionary *recordSettings = [[NSMutableDictionary alloc] init];
        // 设置编码格式
        [recordSettings setValue :[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey: AVFormatIDKey];
        // 采样率
        [recordSettings setValue :[NSNumber numberWithFloat:11025.0] forKey: AVSampleRateKey];
        // 通道数
        [recordSettings setValue :[NSNumber numberWithInt:2] forKey: AVNumberOfChannelsKey];
        //音频质量,采样质量
        [recordSettings setValue:[NSNumber numberWithInt:AVAudioQualityMin] forKey:AVEncoderAudioQualityKey];

        // 3. 创建录音对象
        _audioRecorder = [[AVAudioRecorder alloc] initWithURL:url settings:recordSettings error:nil];
    }
    return _audioRecorder;
}

4，开始录音

//准备录音
[self.audioRecorder prepareToRecord];
//开始录音
[self.audioRecorder record];
   // 几秒后开始录音
   // [self.audioRecorder recordAtTime:self.audioRecorder.deviceCurrentTime + 5];
  // 录音录多久
  //[self.audioRecorder recordForDuration:5];

5,结束录音

  if (self.audioRecorder.currentTime>2) {
        [self.audioRecorder stop];
    }else{
        NSLog(@"录音时间不超过2秒，删除");
         [self.audioRecorder stop];
        [self.audioRecorder deleteRecording];
    }

6，播放声音

if ([self.player isPlaying])return;
    
    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:self.recordFileUrl error:nil];
    
    [self.player play];