make UIView in UIScrollView stick to the top when scrolled up

Question

So in a UITableView when you have sections the section view sticks to the top until the next section overlaps it and then it replaces it on top. I want to have a similar eff

Answer 1

Evya's solution works really well, however if you use Auto Layout, you should do something like this (The Auto Layout syntax is written in Masonry, but you get the idea.):

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {

    //Make the header view sticky to the top.
    [self.headerView mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.scrollView.mas_top).with.offset(scrollView.contentOffset.y);
        make.left.equalTo(self.scrollView.mas_left);
        make.right.equalTo(self.scrollView.mas_right);

        make.height.equalTo(@(headerViewHeight));
    }];

    [self.scrollView bringSubviewToFront:self.headerView];
}