Can you list and explain the main functions of the UIWindow class in iOS?

The UIWindow class in iOS represents the application's window, which acts as a container for displaying all visual elements (UIView). Main functions and properties of UIWindow:

• rootViewController — the controller that is the root for the window, managing the main interface.
• makeKeyAndVisible() — makes the window key (receiving events) and visible on the screen.
• isKeyWindow — a boolean property indicating whether the window is the key window.
• screen — the screen on which the window is displayed (useful for working with multiple screens).
• windowLevel — the level of the window, determining its display order above other windows (e.g., for pop-up windows).

Example usage:

let window = UIWindow(frame: UIScreen.main.bounds)
window.rootViewController = myViewController
window.makeKeyAndVisible()

Thus, UIWindow manages the display and interaction with the user interface at the window level.