title: I can't add a barButton Item to a navigationBar
body: <p>I Embedded a <code>ViewController</code> in a <code>UINavigationController</code> and after that, I added a new <code>ViewController</code> and connected it with a segue to the first <code>ViewController</code> that is embedded in a <code>UINavigationController</code>. then I wanted to add a <code>BarButtonItem</code> to that second view, but when I let go the bar button item in the top of the view next to the title, it inserts it at the button, and when I run the app it only shows the back button to the first screen and the title. (see the picture of how it looks when running and how it looks after inserting it at the top)<a href="https://i.stack.imgur.com/mDgsp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mDgsp.png" alt="running the app in the iPad simulator"></a><a href="https://i.stack.imgur.com/am1Ln.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/am1Ln.png" alt="how the interface-builder looks after inserting the barbuttonitem to the top"></a></p>
  
  <p>I hope you understood the question and you can help me!</p>
  
  <p>thanks in advance!</p>
  
  <p>Benji</p>