ネームスペース変更は、下記の 21:27ぐらいからの、Framework Updates - Swiftification - Nesting で話されてることですかねー。 What's New in Cocoa Touch https://developer.apple.com/videos/play/wwdc2018/202/

What's New in Cocoa Touch - WWDC 2018 - Videos - Apple Developer

iOS 12 enhances the Cocoa Touch frameworks to improve app performance and deliver exciting new features. Learn about performance best...