Windows and screens
Provide a container for your view hierarchies and other content.
Overview
Window objects act as containers for your app’s onscreen content, and screens report the characteristics of the underlying display to your app. Use Scenes to configure and manage your user interface, and review UIScreen objects to understand the device’s main screen or connected displays.
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A UIWindow object provides no visible content of its own. All of the window’s visible content is provided by its root view controller, which you configure in your app’s storyboards. The window’s role is to receive events from UIKit and to forward any relevant events to the root view controller and associated views. UIKit provides an initial window for you to use, and you can create additional windows as needed.
Topics
Windows
Scenes
Popovers
Displaying transient content in a popoverUIPopoverPresentationControllerUIPopoverBackgroundViewUIPopoverBackgroundViewMethods