UITableViewCell 分隔线顶头显示

原因是默认有INSET，需要重新置为0.

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath

{

    // Remove seperator inset

    if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {

        [cell setSeparatorInset:UIEdgeInsetsZero];

    }

    

    // Prevent the cell from inheriting the Table View's margin settings

    if ([cell respondsToSelector:@selector(setPreservesSuperviewLayoutMargins:)]) {

        [cell setPreservesSuperviewLayoutMargins:NO];

    }

    

    // Explictly set your cell's layout margins

    if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {

        [cell setLayoutMargins:UIEdgeInsetsZero];

    }

}