IOS development to achieve the recording function

Import framework:

#import <AVFoundation/AVFoundation.h>

Declare global variables:

@interface ViewController ()<AVAudioRecorderDelegate>
{
  AVAudioRecorder *audioRecorder;
}
@end

In ViewDidLoad:

 UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
  button.frame = CGRectMake(100, 100, 100, 100);
  [button setTitle:@"TICK" forState:UIControlStateNormal];
  button.backgroundColor = [UIColor brownColor];
  [button addTarget:self action:@selector(startAudioRecoder:) forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:button];

Button trigger event

- (void)startAudioRecoder:(UIButton *)sender{
  sender.selected = !sender.selected;
  if (sender.selected != YES) {
    [audioRecorder stop];
    return;
  }
  
  //  URL Is local URL AVAudioRecorder Need to be 1 The path to storage 
  NSString *name = [NSString stringWithFormat:@"%d.aiff",(int)[NSDate date].timeIntervalSince1970];
  
  NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).firstObject stringByAppendingPathComponent:name];
  NSError *error;
  //   The tape recorder   Initialize the 
  audioRecorder = [[AVAudioRecorder alloc]initWithURL:[NSURL fileURLWithPath:path] settings:@{AVNumberOfChannelsKey:@2,AVSampleRateKey:@44100,AVLinearPCMBitDepthKey:@32,AVEncoderAudioQualityKey:@(AVAudioQualityMax),AVEncoderBitRateKey:@128000} error:&error];
  [audioRecorder prepareToRecord];
  [audioRecorder record];
  audioRecorder.delegate = self;
  /*
   1.AVNumberOfChannelsKey  The channel number   It is usually a double track   value 2
   2.AVSampleRateKey  Sampling rate   unit HZ  Usually set to 44100  That is 44.1k
   3.AVLinearPCMBitDepthKey  Bit rate  8 16 24 32
   4.AVEncoderAudioQualityKey  Sound quality 
        1.  AVAudioQualityMin  = 0,  Minimum mass 
        2.  AVAudioQualityLow  = 0x20,  Lower quality 
        3.  AVAudioQualityMedium = 0x40,  Intermediate mass 
        (4)  AVAudioQualityHigh  = 0x60, High quality 
        5.  AVAudioQualityMax  = 0x7F  The best quality 
   5.AVEncoderBitRateKey  The bit rate of audio encoding   unit Kbps  Rate of transmission  1 A set 128000  That is 128kbps
   
   */
  
  
  
  NSLog(@"%@",path);

}

Agent method:

- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag{
  NSLog(@" End of the recording ");
//   File operation class 
 NSFileManager *manger = [NSFileManager defaultManager];

  NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
//   Gets all subfiles of the current file subpathsAtPath
  NSArray *pathlList = [manger subpathsAtPath:path];

//   You only need to get the recording file 
  NSMutableArray *audioPathList = [NSMutableArray array];
//   Walk through all the subfiles in this folder 
  for (NSString *audioPath in pathlList) {
//     By comparing the file's extension name (extension)   The final syllable)   To distinguish whether it is a recording file 
    if ([audioPath.pathExtension isEqualToString:@"aiff"]) {
//       Put the filtered files into an array 
      [audioPathList addObject:audioPath];
    }
  }
  
  NSLog(@"%@",audioPathList);
  
}