change UITableViewCell background color when selected
<p>i have a UItableview and i want to change the cell background when it is seleceted and keep it like that so i tried to use 
                [cell setBackgroundColor:[UIColor purpleColor]];
but that made other cells get colored at same time and i dont know why
i also tried to use 
  [cell.textLabel setBackgroundColor:[UIColor purpleColor]];
but when i select another cell the background go back to white color
so any ideas for solving that problem??</p>
