title: UIBarButtonItem change font after close modal ViewController
body: <p>I set default appearance in AppDelegate:</p>
  
  <pre><code>NSDictionary *barButtonAppearanceDict = @{NSFontAttributeName : FONT_MAIN_NAVIGATION};
  [[UIBarButtonItem appearance] setTitleTextAttributes:barButtonAppearanceDict forState:UIControlStateNormal];
  [[UIBarButtonItem appearance] setTitleTextAttributes:barButtonAppearanceDict forState:UIControlStateApplication];
  [[UIBarButtonItem appearance] setTitleTextAttributes:barButtonAppearanceDict forState:UIControlStateDisabled];
  [[UIBarButtonItem appearance] setTitleTextAttributes:barButtonAppearanceDict forState:UIControlStateHighlighted];
  [[UIBarButtonItem appearance] setTitleTextAttributes:barButtonAppearanceDict forState:UIControlStateReserved];
  [[UIBarButtonItem appearance] setTitleTextAttributes:barButtonAppearanceDict forState:UIControlStateSelected];
  </code></pre>
  
  <p>I open first ViewController (navigation bar item is OK= FONT_MAIN_NAVIGATION) and then I open modal ViewController and when dismiss modal viewController first ViewController change navigation bar item to default. Why did it change it back to default, because I do not set it anywhere else. How could I prevent (fix) it.</p>