UISplitViewController.Style.unspecified
The split view interface uses the classic split view style.
Declaration
case unspecifiedDiscussion
A split view controller with this style represents a classic split view controller created using any other approach than init(style:). You cannot create a split view controller with a style of UISplitViewController.Style.unspecified using this initializer.
Split view controllers with this style don’t support any column-style APIs, such as setViewController(_:for:).