title: UITableView: Run code when tableFooterView is displayed?
body: <p>I'm using the UIView <em><a href="http://developer.apple.com/library/ios/#documentation/uikit/reference/UITableView_Class/Reference/Reference.html#//apple_ref/occ/instp/UITableView/tableFooterView">tableFooterView</a></em> of in my UITableView to show a "Loading more" label at the bottom of my table. When the UIView in <em>tableFooterView</em> is shown, I need to start some lazy download of content. How do I know when the tableFooterView is displayed?</p>