Saving MP3 to Documents folder in iOS

savemp3.m

- (IBAction)saveRingtoneButtonClicked:(UIButton *)sender {
    m_saveRingtoneButtonLowlighted = false;
    m_saveRingtoneButtonHighlighted = true;
    [self animateSaveRingtoneButton];

    NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,true);
    NSString* sourceFilePath = [[NSBundle mainBundle] pathForResource:[m_activeClip.mp3 componentsSeparatedByString:@"."][0] ofType:@"mp3"];

    NSData* mainBundleFile = [NSData dataWithContentsOfFile:sourceFilePath];

    NSString* exportPath = [[paths objectAtIndex:0] stringByAppendingPathComponent:m_activeClip.mp3];
    NSLog(sourceFilePath);
    NSLog(exportPath);

    @try {

        [[NSFileManager defaultManager] createFileAtPath:exportPath contents:mainBundleFile attributes:nil];
        NSLog(@"Ring tone save OK");
        [[[GAI sharedInstance] defaultTracker] sendEventWithCategory:@"Ringtone" withAction:@"Save" withLabel:m_activeClip.clipID withValue:0];

        UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Clip exported" message:@"We've exported the clip as an MP3 - find it in the 'Documents' folder for this app in iTunes." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];

        [alert show];
    }
    @catch (NSException* ex)
    {
        NSLog(@"Ring tone save failed");
    }

}