title: Animation on top of uiviewcontroller like facebook app
body: <p>The new facebook app has a new feature. There is a little circle in the bottom of a message that means where is the user in the conversation. (hist last seen message).</p>
  
  <p>It is pretty awesome, but i couldn´t figure out how it was developed. I´m pretty sure they created a new cell type, to show where is each user in the conversation. And then, if the user reads it, it just update the table and the user will be in another message that he just read. This would be ok.</p>
  
  <p>But my question is, during this transition, the little circle is animated from the current message to the new position, and the others little circle are animated to make space for the new coming little circle. How is that possible? To animate something on top of a listview?</p>
  
  <p>Thanks in regards,</p>