title: Implementing 3D Maps with MKMapView in iOS7
body: <p>I've dropped an MKMapView into my project in Interface Builder and checked the ratio button for "3D Perspective". </p>
  
  <p>But when I run the app, I'm unable to adjust the pitch using a two finger swipe, so it's appearing as though the 3D Perspective simply isn't functioning.</p>
  
  <p>What am I doing wrong?</p>