IOS tableViewCell设置分割线

 //1.比如我们只需要显示固定的几行cell,去掉底部多余的表格线
[tableView setTableFooterView:[[UIView alloc] initWithFrame:CGRectZero]];


 //  2.1在代理方法中设置cell分割线 顶头显示

- (UITableViewCell *)tableView:(UITableView *)tableView
     cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell =
    [tableView dequeueReusableCellWithIdentifier:@"myCell"];

if (cell == nil) {
  cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                reuseIdentifier:@"myCell"];
}

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

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

if([cell respondsToSelector:@selector(setPreservesSuperviewLayoutMargins:)]){
    [cell setPreservesSuperviewLayoutMargins:NO];
}

}



// 2.2.在自定义tableViewCell中设置分割线 顶头显示
// self代表cell。
    if ([self respondsToSelector:@selector(setSeparatorInset:)]) {
        [self setSeparatorInset:UIEdgeInsetsZero];
    }
    
   if ([self respondsToSelector:@selector(setLayoutMargins:)]) {
        [self setLayoutMargins:UIEdgeInsetsZero];
    }
    
    if([self respondsToSelector:@selector(setPreservesSuperviewLayoutMargins:)]){
       [self setPreservesSuperviewLayoutMargins:NO];
    }