title: Refresh UITableView tableFooterView without reloading whole table data
body: <p>I have a table with section footers and table footer. It receives data from core data. When data change, I have no problem reloading both each single data and section footers, but can't be able to reload the <code>tableFooterView</code>.</p>
  
  <p>I have something like that:</p>
  
  <pre><code>1
  2
  3
  Section footer: 6
  4
  5
  Section footer: 9
  Table footer: 15
  </code></pre>
  
  <p>The main issue is that I have an animation on <code>-willDisplayCell</code> and every time I do <code>[self.tableView reloadData]</code> it fires on every cell and is a mess. I can't find out how to reload just the table footer. Any ideas will be welcome.</p>