title: How to add right button in the navigation bar?
body: <p>I have a question to add a right button in navigation bar..</p>
  
  <p>I have two views: View A and View B</p>
  
  <p>I add a navigation bar to view A, after I used <code>self.navigationController!.pushViewController</code> to show view B.</p>
  
  <p>That show a back button in the left of navigation bar of view B automatic, it is good. but now I want to add a button in the right of navigation bar of view B.. 
  I have tried some answers, but it doesn't work...
  I have tried answers likes :
  1) <a href="https://www.hackingwithswift.com/example-code/uikit/how-to-add-a-bar-button-to-a-navigation-bar" rel="noreferrer">https://www.hackingwithswift.com/example-code/uikit/how-to-add-a-bar-button-to-a-navigation-bar</a>
  2)<a href="http://blog.apoorvmote.com/add-multiple-bar-button-item-navigation-bar/?lang=fr" rel="noreferrer">http://blog.apoorvmote.com/add-multiple-bar-button-item-navigation-bar/?lang=fr</a></p>
  
  <p>Could you help me, thank you !</p>