title: Changing navigation bar title in MFMailComposeViewController
body: <p>It seems like I am not able to change the title on the navigation bar, which gets set to the Subject of the email (in this case "My Subject"). In this case I'd like to get rid of the title, either using an empty string as title or rendering the title invisible.</p>
  
  <pre><code>MFMailComposeViewController *mfViewController = [[MFMailComposeViewController alloc] init];
  mfViewController.mailComposeDelegate = self;       
  [mfViewController setSubject:[NSString stringWithFormat:@"My Subject"]];
  [mfViewController setMessageBody:[self emailBody] isHTML:NO];
  [mfViewController setTitle:@""];
  </code></pre>