title: UIViewController present and dismiss
body: <p>There are 3 viewControllers available in my code.i wrote the code to present 3rd view controller from first view controller.</p>
  
  <p>There are 2 buttons available in 3rd view controller.(done and cancel).when i tap the done button 2nd view controller need to be present.</p>
  
  <p>How to write the code for that?</p>