title: Custom UINavigationController UIToolbar subclass
body: <p>I need to work with a subclassed <code>UIToolbar</code> in the <code>UINavigationController</code>. I know this can be done via <code>Interface Builder</code> but I need it to be done programatically.</p>
  
  <p>The docs state that the <code>UINavigationController</code> toolbar property is readonly so I'm at a bit of a loss as to how I proceed.</p>
  
  <p>Related:</p>
  
  <ul>
  <li><a href="https://stackoverflow.com/a/3323636/1106878" title="Custom UINavigationController UIToolbar Background Image">Custom UINavigationController UIToolbar Background Image</a></li>
  </ul>