Shrink large title when scrolling (not UITableViewController) iOS 11

I used dsk1306 solutions, see above. But in my case I had a WebView in the UIViewController with the large title.

So I had to set the UIWebView ScrollView delegate:

self.webView.scrollView.delegate = self

and

extension MyViewController: UIScrollViewDelegate {

func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
if #available(iOS 11.0, *) {
UIView.animate(withDuration: 0.5, animations: {
self.navigationController?.navigationBar.prefersLargeTitles = (velocity.y < 0)
})
}
}

}

I've used something that is similar to [Kamil Szostakowski][1]'s answer for view with UICollectionView.

func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
UIView.animate(withDuration: 0.5, animations: {
self.navigationController?.navigationBar.prefersLargeTitles = (velocity.y < 0)
})
}

It may be not so smooth but I haven't found better option yet.

[1]:

[To see links please register here]

Have you tried something like this? It converts the large title display mode when the content is scrolled up.

class P1ViewController: UIViewController, UIScrollViewDelegate
{
var canTransitionToLarge = false
var canTransitionToSmall = true

func scrollViewDidScroll(_ scrollView: UIScrollView)
{
if canTransitionToLarge && scrollView.contentOffset.y <= 0 {
UIView.animate(withDuration: 0.5) {
self.navigationItem.largeTitleDisplayMode = .always
}
canTransitionToLarge = false
canTransitionToSmall = true
}
else if canTransitionToSmall && scrollView.contentOffset.y > 0 {
UIView.animate(withDuration: 0.5) {
self.navigationItem.largeTitleDisplayMode = .never
}
canTransitionToLarge = true
canTransitionToSmall = false
}
}
}