title: how to tell table draw heightForFooterInSection
body: <p>My table view has 8 sections and I set the height for footer of the last section (section 7) is 80 so that the view of the table is friendly to user. </p>
  
  <pre><code>- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {
      switch (section) {
          case 7:
              return 80;
      }
      return 10;
  }
  </code></pre>
  
  <p>My cell has a text field and i program so that when a keyboard pops up, I still can scroll the 
  table and see every section. When the keyboard is dismissed, I notice that the height for footer of the last section has been shrinking a bit.</p>
  
  <p>My question : how can I force me table to redraw the height for footer of sections after dismissing the keyboard </p>