You want to be able to record audio files on an iOS device.

Make sure you have added the CoreAudio.framework framework to your target file, and use the AVAudioRecorder class in the AV Foundation framework:

NSError   *error = nil;

NSString *pathAsString = [self audioRecordingPath];

NSURL *audioRecordingURL = [NSURL fileURLWithPath:pathAsString];

self.audioRecorder = [[AVAudioRecorder alloc] 
                      initWithURL:audioRecordingURL
                      settings:[self audioRecordingSettings]
                      error:&error];

For information about the audioRecordingSettings and audioRecordingPath methods used in this example, refer to this recipe’s Discussion.