title: Apply shadow to the navigation bar in swift
body: <p>In my design navigation of app have nice shadow and i want to apply in my code.
  How to i can create this effect?</p>
  
  <p><a href="https://i.stack.imgur.com/hvhiG.png" rel="noreferrer"><img src="https://i.stack.imgur.com/hvhiG.png" alt="enter image description here"></a></p>