title: self removeFromSuperView don't release self?
body: <p>I dynamically add a subview to  another uiview;</p>
  
  <p>in the subview ,click a button  to go back by the following method:</p>
  
  <pre><code>[self removeFromSuperView ];
  </code></pre>
  
  <p>but after manny times added subview and removed it,my app could crash ,the log said it was killed .</p>
  
  <p>I found that calling <code>[self removeFromSuperView]</code> didn't release self. So what's the best methods to releas it?</p>