title: how to find index path within UITableView when a custom button is pressed
body: <p>I have a tableview of which each cell has a custom button.  I have this method which tells me the index path where the button was located.  The method below works fantastic in iOS 6, but I am not sure how to get the same result in iOS 5 since indexPathForItem is only available in iOS 6.0 and later.</p>
  
  <pre><code>- (IBAction) checkUncheck:(id)sender
  {
      UIButton *sendingButton = (UIButton *) sender;
      UITableViewCell *cell =  (UITableViewCell *)[[sendingButton superview] superview];
      PDFFile *newPDF = [_pdfDocument.pdfFileList objectAtIndex: cell.tag];
      [newPDF setCheck: [NSNumber numberWithBool: ![newPDF.check boolValue]]];
  
      NSIndexPath *path = [NSIndexPath indexPathForItem: cell.tag inSection: 0];
  
      [_table reloadRowsAtIndexPaths:[NSArray arrayWithObjects: path, nil] withRowAnimation: UITableViewRowAnimationAutomatic];
  }
  </code></pre>