title: How can I add a common view to multiple ViewControllers in iOS Swift?
body: <p>I'm kinda new to iOS development.<br>
  I want to have a custom View and some Labels inside it. And In some viewControllers of my app on a button click I want to add/show that View
  at the bottom of that viewController. </p>
  
  <p>As far as I'm manually adding the view in storyboard in all the viewControllers in which I want the view to display. But this is not efficient. How can I add this view in viewControllers programmatically on button click? </p>