title: How to animate the height change of an section header in UITableView?
body: <p>I've implemented this method to return the section header height. However, when the height for the section changes, it happens immediately without animation. </p>
  
  <p><strong>Is there an animation for that?</strong></p>
  
  <pre><code>- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
      if (flatHeader) {
          return 50.0f;
      } else {
          return 100.0f;
      }
  }
  </code></pre>