title: Getting started creating custom view transitions
body: <p>I'm looking for tutorials on creating custom view transitions.</p>
  
  <p>In particular, transitions that involve elements other than just the UIViews being affected, such as playing an animation over the transition as it is happening or modifying a screenshot of the UIView being transitioned out.</p>
  
  <p>I don't mean implementing the basic set of transitions (slide, fade, etc) for which there's plenty of examples on Apple's site.  I'm talking about adding video/sound/additional animation while wrapping it all in a reusable transition.</p>
  
  <p>I'm vaguely familiar with some of the underlying toolkits (core-animation and quartz) but I'm looking for a no-prior-experience tutorial on the subject.</p>