You can do this by adding two single-pixel subselections just above and below your cell so that they appear on top of the UITableView separator. Here are the specifics:
Subclass UITableViewCell with the IBOutlet UIView * topSeparator property and the IBOutlet UIView * bottomSeparator property.
Set cell.clipsToBounds to NO.
topSeparator CGRectMake (0.0f, -1.0f, cell.width, 1.0) backgroundColor, . ( 10 .)
bottomSeparator CGRectMake (0.0f, cell.height, cell.width, 1.0) backgroundColor, . ( 10 .)
topSeparator.hidden = YES; bottomSeparator.hidden = NO;.
topSeparator.hidden = NO; bottomSeparator.hidden = YES;.
topSeparator.hidden = NO; bottomSeparator.hidden = NO;
, , UITableView , .