iOS中录制音频的简单示例

// 音频文件目录
NSString *path = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];

NSString *folder = [path stringByAppendingString:@"/Audio"];
    
NSFileManager *fileManager = [NSFileManager defaultManager];
    
if(![fileManager fileExistsAtPath:folder]){ // 如果不存在，那么建立这个文件夹
        
        [fileManager createDirectoryAtPath:folder withIntermediateDirectories:YES attributes:nil error:nil];
 }
// 时间戳
NSDate *date = [NSDate date];
NSInteger timeInterval = [date timeIntervalSince1970]*1000;    
NSString *timeStamp = [NSString stringWithFormat:@"%ld", timeInterval];

// 音频文件完整路径
NSString *fileFullName = [NSString stringWithFormat:@"%@.aac", timeStamp];
NSString *storePath = [path stringByAppendingPathComponent:fileFullName];

NSError *error = nil;
// 初始化录音机
NSDictionary *setting = [NSDictionary
                                                  dictionaryWithObjectsAndKeys:
                                                  [NSNumber numberWithInt:kAudioFormatMPEG4AAC],AVFormatIDKey,
                                                  [NSNumber numberWithInt:44100],AVSampleRateKey,
                                                  [NSNumber numberWithInt:1],AVNumberOfChannelsKey,
                                                  [NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,
                                                  [NSNumber numberWithBool:NO],AVLinearPCMIsBigEndianKey,
                                                  [NSNumber numberWithBool:NO],AVLinearPCMIsFloatKey,
                                                  nil];

 AVAudioRecorder *recorder = [[AVAudioRecorder alloc]
                 initWithURL:[NSURL URLWithString:path]
                 settings:setting
                 error:&error];
   
  [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error: nil];
    [[AVAudioSession sharedInstance] setActive: YES error: nil];
    
    AVAudioSession *session = [AVAudioSession sharedInstance];
    NSError *setCategoryError = nil;
    
    if (![session setCategory:AVAudioSessionCategoryPlayAndRecord
                  withOptions:AVAudioSessionCategoryOptionMixWithOthers
                        error:&setCategoryError]) {
        // handle error
        NSLog(@"Failed to setup audio session %@", setCategoryError.description);
        
        if(callBack) {
            
            callBack(NO, 4, @"录音链接建立失败");
        }
    } else {
        
        if(callBack) {
            
            callBack(YES, 1, @"录音链接建立成功");
        }
        
        [recorder prepareToRecord];
        [recorder recordForDuration:audioMaxDuration];
    }