title: How to set programmatically topBar and bottomBar parameters of UIView?
body: <p>In the interface builder there are few parameters for UIView of UIViewController:
  topBar, bottomBar, ...</p>
  
  <p><img src="https://i.stack.imgur.com/ZSdW6.png" alt="enter image description here">
  interface builder parameters of view</p>
  
  <p>What happens when i set Navigation Bar value for Top Bar parameter,
  and Tab bar for Bottom Bar parameter? It is very useful to me.</p>
  
  <p>So, how can i do it programmatically?</p>