title: How to change UIBarButtonItem tint color for MFMailComposeViewController when presented automatically from UITextView
body: <p>I know when I manually present mailComposeViewController I can do it like this:</p>
  
  <pre><code>mailComposeViewController.navigationBar.tintColor = UIColor.white
  </code></pre>
  
  <p>but since the controller is presented out of my control because in <code>UITextView</code> an email was detected... it cannot be changed this way:</p>
  
  <pre><code>UINavigationBar.appearance().tintColor = UIColor.white
  </code></pre>
  
  <p>The above solution doesnt work. It is still blue. How can I customize it?</p>