title: Expanding and collapsing UITableViewCells with DatePicker
body: <p>I'm building an app that lets the user select dates from a UITableView. The tableView is static and grouped. I've looked through many questions, including <a href="https://stackoverflow.com/questions/18973573/ios-7-how-to-display-a-date-picker-in-place-in-a-table-view">this one</a>, trying to figure out how to accomplish this - but nothing seems to work optimal. Apple's calendar app features a very smooth and nice animation that none of the examples I've been through have managed to recreate.</p>
  
  <p>This is my desired result:</p>
  
  <p><img src="https://i.stack.imgur.com/hUDZK.png" alt="In-place date picker"></p>
  
  <p>Could someone point me to a tutorial or explain how I can accomplish such a smooth animation with the most concise and straight forward way of doing it, like we see in the calendar app?</p>
  
  <p>Thanks alot!</p>
  
  <p>Erik</p>