how to see the visible viewcontroller 

i have a problem like the picture and i can not do it with your library .
<img width="712" alt="screen shot 2017-11-02 at 9 43 44 am" src="https://user-images.githubusercontent.com/12764798/32307303-7be2c634-bfb2-11e7-8971-6d148007dd3a.png">

