ios tableview section标题不滑动问题

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (scrollView ==_tableView)
{
CGFloat sectionHeaderHeight = 25;
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);
}
}
}