title: UITableView, replace cell view on selection
body: <p>Is it possible to replace a cell view for the selected cell? I have registered my controller as a data source and delegate. Requests for cell views, row numbers, selection status, etc, all come in nicely. In the cell selection callbacks, I'm trying to have the table view reload the cell with a new view (not the actual data!). Basically, I want the cell view to expand and show more of the underlying data, if it is selected. The problem is that I have no clue how to make the table view ask my controller for a new view. I can see that the view is requesting the cell height, but nothing more.</p>
  
  <p>Calling reloadData on the view works, but it's inefficient and comes with a set of its own problems (animation possibilities, maintaining selection state, etc).</p>