tableview中需要header随着cell一起滚动

可以加入以下方法：

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
   CGFloat sectionHeaderHeight =
40;
   if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView.contentOffset.y>=0)
{
        scrollView.contentInset =UIEdgeInsetsMake(-scrollView.contentOffset.y,0,
0, 0);
    }
   else
if (scrollView.contentOffset.y>=sectionHeaderHeight) {
        scrollView.contentInset =UIEdgeInsetsMake(-sectionHeaderHeight,
0, 0,
0);
    }
}