title: why is setAnimationDidStopSelector discouraged?
body: <p>i saw the following in apples documentation on setAnimationDidStopSelector:</p>
  
  <p>"Use of this method is discouraged in iOS 4.0 and later. If you are using the block-based animation methods, you can include your delegate’s end code directly inside your block."</p>
  
  <p>I tried adding what I was going to put inside the animation stop delegate inside the animation block, but the animation doesn't look the same as when i used setAnimationDidStopSelector.</p>
  
  <p>What is the reason for discouraging the use of setAnimationDidStopSelector?</p>