不让UITableView分组标题悬停顶部的解决方法

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    
    CGFloat sectionHeaderHeight = 126; 
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);
    }
}