title: Animating the present and dismiss of a Share Extension with custom UI on iOS 8
body: <p>I'm developing a Share Extension for iOS 8 with custom UI, but it appears without animation, how can I do this? It's a regular UIViewController.</p>
  
  <p>Also, it appears on fullscreen on iPad and I want it to be a modal view controller, that appears in the center of the screen and doesn't fit it, how can I do this?</p>
  
  <p>Regards.</p>