title: Overriding iOS Storyboard Constraints
body: <p>How can you alter constraints that are set in the Storyboard?</p>
  
  <p>I am trying to mimic the Twitter iOS profile page where the header shrinks as you scroll down.</p>
  
  <p>I have a UIScrollView that takes up the entire view.  I then have a UITableView within the UIScrollView.  Within the storyboard I must set a fixed height for the UITableView.  So is has the constraint of Equals Height = 350.</p>
  
  <p>I then try to change the height of it programmatically:</p>
  
  <pre><code> tableView.frame = CGRectMake(0, 0, scrollView.frame.width, scrollView.frame.height - 30)
  </code></pre>
  
  <p>When I do this it doesn't affect the size of the UITableView at all.  I'm assuming this is because of the storyboard constraints.</p>
  
  <p>Am I missing something or do I need to do this programmatically to start with?</p>