This is my story board: 

[![enter image description here](https://i.stack.imgur.com/U4QbG.png)](https://i.stack.imgur.com/U4QbG.png)

Whenever I jump to a view controller embedded in navigation controller, the navigation bar is shown but empty, why? 

The sequence I created it is:

1. connect buttons with destination view controllers
2. embed destination view controllers in navigation view controller

And the segue I use is present modally - cross dissolve.