How do I create & open an immersive space window scene from a UIKit view or view controller? I need to create one in order to use Compositor Services in order to draw a 3D object using Metal, but this particular GUI is drawn & laid out using UIKit, and it isn't possible for me to rewrite it to use SwiftUI.
I already tried [UIApplication.sharedApplication activateSceneSessionForRequest:[UISceneSessionActivationRequest requestWithRole:UISceneSessionRoleImmersiveSpaceApplication] errorHandler:...], but all that happened was it opened a new window for the main application scene (UIWindowSceneSessionRoleApplication), instead of opening an immersive space scene as I expected.
Yes, I did create a scene manifest in my app's Info.plist, with a UIWindowSceneSessionRoleApplication scene, and a CPSceneSessionRoleImmersiveSpaceApplication scene. Surely there has to be a way to do this without resorting to SwiftUI...