title: Getting visible cell from UITableView pagingEnabled
body: <p>I have a UITableView with pagingEnabled.  Each cell takes up the viewing area of the table.  Meaning, each cell is the same height and width as the table.  I'm using custom cells that have a name property.  I'd like to display the name of the current (viewable) cell in a label.  This works fine for the first and last cells but anything inbetween isn't so easy.  The problem is that cellForRowAtIndexPath is called twice for these middle cells.  Here's what it looks like scrolling from the first to last cell and then back.  I've listed the indexes in order as cellForRowAtIndexPath fires for that row:</p>
  
  <pre><code>Row             indexPath.row
   0                   0         //view loads and table appears
   1                  1,2        //user scrolls to second cell. cellForRowAtIndexPath fires twice.  First time indexPath.row is one and second time it is two.  This causes cell two's name to display in the label, rather than cell one.
   2                  2,3
   3                   3
   //user starts scrolling back to first cell
   2                  1,2 
   1                  1,0
   0                   0
  </code></pre>
  
  <p>I could set use an NSDate object to detect if I'm in a middle row. By diffing the previous time with current, I'll know.  However, if the user scrolls really fast through the cells, that probably doesn't work.  Is there another way to do it?</p>
  
  <p>I've tried using variations of visiblecells properties but that didn't work.  The UITableView will load the next cell even if it isn't visible, causing it to be part of the visible cells.</p>