清除UITableView底部多余的分割线

plain类型的tableview当显示的数据很少时，下面的cell即使不显示数据也会有分割线，可以通过下面这个函数去掉多余的分割线。

- (void)setExtraCellLineHidden: (UITableView *)tableView

{

    UIView *view =[ [UIView alloc]init];

    view.backgroundColor = [UIColor clearColor];

    [tableView setTableFooterView:view];

    [view release];

}

当tableview的dataSource为空时，也就是没有数据可显示时，该方法无效，只能在numberOfRowsInsection函数，通过判断dataSouce的数据个数，如果为零可以将tableview的separatorStyle设置为UITableViewCellSeparatorStyleNone去掉分割线，然后在大于零时将其设置为

UITableViewCellSeparatorStyleSingleLine

if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];

    // Drawing our own separatorLine here because I need to turn it off for the
    // last row. I can only do that on the tableView and on on specific cells.
    // The y position below has to be 1 less than the cell height to keep it from
    // disappearing when the tableView is scrolled.
    UIImageView *separatorLine = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, cell.frame.size.height - 1.0f, cell.frame.size.width, 1.0f)];
    separatorLine.image = [[UIImage imageNamed:@"grayDot"] stretchableImageWithLeftCapWidth:1 topCapHeight:0];
    separatorLine.tag = 4;

    [cell.contentView addSubview:separatorLine];

    [separatorLine release];
}

// Setup default cell setttings.
...
UIImageView *separatorLine = (UIImageView *)[cell viewWithTag:4];
separatorLine.hidden = NO;
...
// In the cell I want to hide the line, I just hide it.
seperatorLine.hidden = YES;
...

In viewDidLoad:

self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;