tableView sectionHeader悬停在指定位置处理

在scrollViewDidScroll里实现指定的悬停位置

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGFloat contentOffsetY = scrollView.contentOffset.y;
  CGFloat sectionHeiderHeight = kNavHeight; //tabler section 悬停在指定位置处理
    if (scrollView.contentOffset.y < sectionHeiderHeight) {
        scrollView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);
    }else {
        scrollView.contentInset = UIEdgeInsetsMake(sectionHeiderHeight, 0, 0, 0);
   }
}