title: Swift - Fading cells in UITableView
body: <p>I'm having troubles with my UITableView in swift on Xcode 6 :</p>
  
  <p>I would like my UITableView cells to fade in / out when appearing / disappearing.</p>
  
  <p>I looked a lot on the web for fade animations but I didn't find what I wanted because it's based on duration animations.</p>
  
  <p>I Think what I need is sort of mask based on alpha ? I'm not sur and I don't even know have to create one...</p>
  
  <p>I have a UIViewController containing a tableView and some blank space (for now) upside and downside of the UITableView.</p>
  
  <p>Thank's for your help !!</p>
  
  <p>Best,</p>
  
  <p>Anatole</p>