UITableViewCell 设置选中状态下颜色

    cell.selectedBackgroundView=[[UIView alloc]initWithFrame:cell.frame];
    cell.selectedBackgroundView.backgroundColor=[UIColor whiteColor];
设置当前cell为选中状态
long numOfSelectedCell = [tableView indexPathForCell:cell].row;
    if (indexPath.row==numOfSelectedCell) {
        [self.tableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:UITableViewScrollPositionNone];
    }