iphone - 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 effect, where basically I have a UIView in my UIScrollView, representing the sections UIView and when it hits the top.. I want it to stay in there and not get carried up. How do I do this? I think this needs to be done in either layoutSubviews or scrollViewDidScroll and do a manipulation on the UIVIew..

Answer 1

To create UIView in UIScrollView stick to the top when scrolled up do:

func createHeaderView(_ headerView: UIView?) {
    self.headerView = headerView
    headerViewInitialY = self.headerView.frame.origin.y
    scrollView.addSubview(self.headerView)
    scrollView.delegate = self
}

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    let headerFrame = headerView.frame
    headerFrame.origin.y = CGFloat(max(headerViewInitialY, scrollView.contentOffset.y))
    headerView.frame = headerFrame
}