去掉UItableview headerview黏性

#pragma mark - 去掉UItableview headerview黏性
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if (scrollView == _tableView) {
        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);
        }
    }
    return;
}

更详细请阅读：标哥的技术博客