去掉UITableView的header和footer的黏性效果

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

{

CGFloat sectionHeaderHeight = header的高度;

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);

}

}