As forementioned in the Reactant architecture guide, RootView is a protocol and a marker for views that should be the root of a screen (filling the whole screen). Apart from being a marker, it’s also used for communication with its parent controller.
This property is very similar to UIViewController#edgesForExtendedLayout. It specifies whether the view should be positioned behind translucent bars like the UINavigationBar and UITabBar. If you set .all (or .top / .bottom), the parent controller will make sure the view is under those bars. This is often used for root views that contain scroll views or tables.
The default value is [] (or none), meaning that the root view will not be extended under those bars and thus no part of the view will be obstructed.
Called by the parent Controller when the screen will appear.
For more information take a look at UIViewController#viewWillAppear
Called by the parent Controller when the screen did appear.
For more information take a look at UIViewController#viewDidAppear
Called by the parent Controller when the screen will disappear.
For more information take a look at UIViewController#viewWillDisappear
Called by the parent Controller when the screen did disappear.
For more information take a look at UIViewController#viewDidDisappear