title: How to add 2 buttons into the UINavigationbar on the right side without IB?
body: <p>How can I add 2 buttons into the <code>UINavigationBar</code> without XIB?<br>
  The 2 buttons should be aligned on the right side of the <code>UINavigationBar</code>.</p>
  
  <p>I know how I can add one button, but how about two?</p>