title: Expand/collapse UITableViewCell to achieve Evernote-like transition
body: <p>I'm interested in achieving a transition between view controllers very similar to the transition in Evernote's iOS app:</p>
  
  <p><img src="https://i.stack.imgur.com/mxk27.gif" alt="enter image description here"></p>
  
  <p>When "Places" is tapped, it smoothly expands into what looks like UINavigationController with a green border around it. To collapse it, I can either tap "Back" or swipe from the left side of the screen to gradually transition to the home screen.</p>
  
  <p>I'm not looking for exact code samples to copy-paste, bur rather for high-level guidance on which concepts and Apple APIs to leverage. More specifically,</p>
  
  <ul>
  <li>Which transition/animation APIs does this likely use?</li>
  <li>How can I achieve the green border around the entire view controller once "Places" is expanded?</li>
  </ul>