title: How to dynamically set background color for UITableView section headers?
body: <p>I'm working on implementing UITableView section headers similar to the Photos app on iPhone. The top header view should have a grey background and the other header views should have a white background. Based on that I have a couple of questions I need help with:</p>
  
  <ol>
  <li><p>How do I find out which section header is on top (e.g. adjacent to the nav bar)? Note, that the navigation bar is translucent (meaning it displays cells below itself), so I can't go by finding visible cells and then retrieving section based on that.</p></li>
  <li><p>What should be the approach to change background color of the top section header to a different color and then back to the original color when it's no longer a top one?</p></li>
  </ol>