title: How to use UINavigationBarAppearance in iOS 13
body: <p>How do you use this new object to customize the navigation bar in iOS 13? I tried the following code in Objective-C but it's not working correctly. It only shows my title text attributes while a view controller is being pushed or popped on to the navigation stack.</p>
  
  <pre><code>UINavigationBarAppearance *appearance = [UINavigationBarAppearance new];
  appearance.titleTextAttributes = @{NSFontAttributeName: font};
  </code></pre>
  
  <p>Here is the documentation for this object.
  <a href="https://developer.apple.com/documentation/uikit/uinavigationbarappearance?language=objc" rel="noreferrer">https://developer.apple.com/documentation/uikit/uinavigationbarappearance?language=objc</a></p>