UITableView HeaderView和FooterView的悬浮(粘性)解决方法

自行更改sectionFooterHeight和sectionHeaderHeight的值

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    //headerView
    if (scrollView == _tableView) {
        //去掉UItableview的section的headerview黏性
        CGFloat sectionHeaderHeight = 36;
        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);
        }
    }
    
    //footerView
    if (scrollView == _tableView) {
        //去掉UItableview的section的footerview黏性
        CGFloat sectionFooterHeight = 10;
        if (scrollView.contentOffset.y<=sectionFooterHeight && scrollView.contentOffset.y>=0) {
            scrollView.contentInset = UIEdgeInsetsMake(0, 0, -sectionFooterHeight, 0);
        } else if (scrollView.contentOffset.y>=sectionFooterHeight) {
            scrollView.contentInset = UIEdgeInsetsMake(0, 0, -sectionFooterHeight, 0);
        }
    }
}