title: Update UITableView titleForFooterInSection for UISlider's valueChanged?
body: <p>I have a UITableViewCell which has a UISlider in it. I have a footer text for the tableview that I would like to update with the value of the UISlider.</p>
  
  <p>However, calling [self.tableView reloadData]; does not work for the UISlider, as it is too many calls. I am able to update the cell correctly (it also shows the value), but I am unable to update the footer text. I have tried:</p>
  
  <pre><code>[self tableView:self.tableView titleForFooterInSection:0];
  </code></pre>
  
  <p>But it doesn't work..</p>