去掉table header footer黏性

footer黏性：

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
｛
  

    CGFloat sectionFooterHeight = 30;

    float bottomH = scrollView.contentSize.height - CGRectGetHeight(scrollView.frame) - scrollView.contentOffset.y;

    if (scrollView.contentOffset.y + sectionFooterHeight >= (scrollView.contentSize.height - CGRectGetHeight(scrollView.frame)))

    {

        scrollView.contentInset = UIEdgeInsetsMake(0, 0, -MAX(bottomH, 0), 0);

        NSLog(@"aaaa");

    }

    else if (scrollView.contentOffset.y >= sectionFooterHeight)

    {

        scrollView.contentInset = UIEdgeInsetsMake(0, 0, -sectionFooterHeight, 0);

        NSLog(@"vvv");

    }

｝

headerview黏性：

- (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);
    }
}

设置table的style为UITableViewStyleGrouped，也能去掉两个的黏性