title: UIScrollView contentOffset change after another view pushed
body: <p>I have a <code>UIViewController</code> in Interface Builder, and I add a <code>UIScrollView</code> to the <code>UIView</code>. It has a <code>contentOffset</code> property equal to 0.0, but when I scroll the <code>UIScrollView</code> to the very bottom and push another view the <code>contentOffset</code> changes.</p>
  
  <p><code>NSLog</code> gives me the following values:</p>
  
  <pre><code>//View just loaded
  2013-09-09 16:19:27.455 my_app[24588:907] Scroll View content offset is 0.000000
  
  //We came back from another view
  2013-09-09 16:19:30.957 my_app[24588:907] Scroll View content offset is 108.000000
  </code></pre>
  
  <p>What's the reason of this behaviour? I've just added a <code>UIScrollView</code> in IB and did nothing in code at all. </p>
  
  <p>The <code>contentHeight</code> of the scrollView is bigger than <code>self.view.height</code>. The <code>frame</code> of the scrollView stays the same.</p>