iOS 11 large navigation bar title unexpected velocity

I solved the problem with these constraints:

    NSLayoutConstraint.activate([
        scrollView.topAnchor.constraint(equalTo: view.topAnchor),
        scrollView.leftAnchor.constraint(equalTo: view.leftAnchor),
        scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        scrollView.rightAnchor.constraint(equalTo: view.rightAnchor)
        ])

You also have to set this property on your UIViewController subclass:

extendedLayoutIncludesOpaqueBars = YES