title: How can a UITableViewCell know of its own indexPath?
body: <p>The standard Grouped <code>UITableView</code> style allows <code>UITableViewCell</code>s to be drawn with rounded corners at the top and bottom of each section.  How is this accomplished?  How does the cell know its own location within its section, and how does it know when to change its rounded edges?</p>
  
  <p>I want to make my own rounded cells, and I have images to use, but don't know when to show which image</p>
  
  <p><strong>Note:</strong> I already know how the UITableView works, and I know how to use it.  I just thought that since a UITableView is able to automatically draw rounded corners at the correct places, I should be able to as well, without needing to add anything to my data source or delegate.</p>