childForPreferredVerticalBarBehavior
Which child view controller, if any, should control the vertical bar behavior.
Declaration
var childForPreferredVerticalBarBehavior: UIViewController? { get }Discussion
Return a child to defer the configuration to it, or nil to use the configuration provided by this view controller. The system container view controllers forward to their active content by default — UINavigationController to its top view controller, UITabBarController to its selected view controller — so a content view controller’s preference flows up to the window of the app or the nearest presentation.