Audio Recording get file size

I am using AVAudioRecorder to record something in my iOS app, and I wanted to get the file size of the recording in bytes. Is there a way I can do that?

This is my code for setting up the recorder:

NSArray *pathComponents = [NSArray arrayWithObjects:
                               [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],
                               @"MyAudioMemo.m4a",
                               nil];
    outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];

    // Setup audio session
    AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];

    // Define the recorder setting
    NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];

    [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
    [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

    // Initiate and prepare the recorder
    recorder = [[AVAudioRecorder alloc] initWithURL:outputFileURL settings:recordSetting error:nil];
    recorder.delegate = self;
    recorder.meteringEnabled = YES;
    [recorder prepareToRecord];

This is where I'm trying to get the file size:

- (void) audioRecorderDidFinishRecording:(AVAudioRecorder *)avrecorder successfully:(BOOL)flag{
    // Convert to NSData
    NSData *data = [NSData dataWithContentsOfFile:recorder.url];
    // Convert to NSString
    NSString* dataAsString = [NSString stringWithUTF8String:[data bytes]];
NSLog(@"Size: %@", dataAsString);
}

The NSLog doesn't return anything. Any help is appreciated.

Ok so I figured it out, you can get the file size by doing this:

unsigned long long size = [[NSFileManager defaultManager] attributesOfItemAtPath:[recorder.url path] error:nil].fileSize;

and then convert it into a string by doing:

NSLog(@"This is the file size of the recording in bytes: %llu", size);