title: ios - stop scroll when reach to expected contentOffset
body: <p>The image <a href="https://www.dropbox.com/s/e7b189mzl168efk/scrollview.png" rel="nofollow">https://www.dropbox.com/s/e7b189mzl168efk/scrollview.png</a> is my scrollview and 4views.
  What I want is when I pulldown the scrollView it display the views base on the offset.
  And I want to stop the scroll when it reach to end view. Currently it still continue to scroll.</p>
  
  <p>its like </p>
  
  <pre><code>if(scrollView.contentOffset.y == -155)
  </code></pre>
  
  <p>then scroll will not continue to scroll but i can still scroll back to the bottom to highlight the view3 or until view1. Please refer on the image.</p>
  
  <p>example code is very helpful.</p>