title: Swift - Overwrite navigation bar
body: <p>When it comes to opening a new View Controller i didnt want it to be presented modally so i pushed it in navigation controller:</p>
  
  <pre><code>let vc = self.storyboard!.instantiateViewControllerWithIdentifier("newView")
  self.navigationController!.pushViewController(vc, animated: true)
  </code></pre>
  
  <p>The View with the identifier "newView" is presented correctly and there is also a navigation bar with a back-button provided, which also works properly.</p>
  
  <p>But how to customize this existing navigation bar, add new bar button items etc.. ?</p>
  
  <p>any suggestions?</p>
  
  <p>Thanks and Greetings!</p>