Use the increased navigation-bar title in iOS 11

The only change done to UINavigationBar API for iOS 11 is prefersLargeTitles.

Documentation here: https://developer.apple.com/documentation/uikit/uinavigationbar/

You can do it to your own apps with one small change: check “Prefers Large Titles” for your navigation bar in IB, or if you prefer to do it in code using:

navigationController?.navigationBar.prefersLargeTitles = true

If you need to change the text attributes of the large title you need to use the new largeTitleTextAttributes property on UINavigationBar:

UINavigationBar.appearance().largeTitleTextAttributes = [
    NSAttributedString.Key.foregroundColor: UIColor.black
]