iOS 11 large-title navigation bar not collapsing

Question

The Apple guy in the What\'s new in Cocoa Touch WWDC video said that the new large-title navigation bar will magically hook into the top-level scroll view of the underlying

Answer 1

Or instead of changing anything in storyboard, do this:

override func viewDidLoad() {
    super.viewDidLoad()
    if #available(iOS 11.0, *) {
        self.navigationItem.largeTitleDisplayMode = .never
        self.navigationItem.largeTitleDisplayMode = .always
    }
}

No matter which language!

This is because large titles on navigation item decides whether or not to collapse on the basis of large title behaviour on previous screen navigation item title.