SwiftUI - How to get access to "WindowScene"

Question

In watching the WWDC 21 videos reference StoreKit 2, there are a few functions that they reference wherein they let a value = WindowScene as follows:

func manageSubscriptions() async {
    if let windowScene = self.view.window?.windowScene {
        do {
            try await AppStore.showManageSubscriptions(in: windowScene)
        } catch {
            //error
        }
    }
}

The let line errors out with the message: Type of expression is ambiguous without more context

If I try and provide more context with something like:

if let windowScene = (self.view.window?.windowScene)! as UIWindowScene {

I am told: Value of type 'MyStruct' has no member 'view'

What am I missing, must be something simple, to gain access to this needed UI element?

Thank you

Added: I'd like to add that I am using a SwiftUI app that was created using a SceneDelegate and AppDelegate, not a simple struct: App, type of structure. So I am guessing I need to access something in the SceneDelegate to get the right object..

Only `UIViewController` and similar have the `view` property. Is `MyClass` a `UIViewController`? — aheze, Jun 23 '21 at 02:33
I updated my question, I meant to say MyStruct, which is a SwiftUI view that interacts with the user and the class that implements the SK2 store.. — JerseyDevel, Jun 23 '21 at 02:35
I think I may need something like this to get access to the root scene: UIApplication.shared.delegate?.window.scene but not 100% sure on it.. — JerseyDevel, Jun 23 '21 at 02:38
well, it doesn't quite work, but i think it gets me closer to where i am supposed to be.. — JerseyDevel, Jun 23 '21 at 02:49
I can get it to run with some messing around, but this shows in the log, and its pretty cryptic, could just be beta being beta: Error Domain=ASDErrorDomain Code=911 "(null)" — JerseyDevel, Jun 23 '21 at 02:50
This func is “supposed” to show a sheet to manage subscriptions. But nothing shows. Ugh. They make it so simple it’s impossible. — JerseyDevel, Jun 23 '21 at 02:57
I prob need to write out the scene and app delegate to the newer version.. — JerseyDevel, Jun 23 '21 at 02:58
"But nothing shows" yeah, I just tried and nothing showed either... you probably need to have subscriptions already set up or something — aheze, Jun 23 '21 at 03:03
Thanks for letting me know so I’m not losing my mind there. — JerseyDevel, Jun 23 '21 at 03:07
Got it working, it was in fact that I had a test store set up and it didn't like that.. But it worked when I turned that off and used my actual available subscriptions.. Thanks again.. — JerseyDevel, Jun 23 '21 at 03:32

score 7 · Answer 1 · edited Jun 24 '21 at 02:00

Just to provide an answer for anyone interested, with all credit to @aheze for finding it and @Matteo Pacini for the solution, to get this specific method to work when using a SwiftUI app that has an AppDelegate/SceneDelegate structure, this will work:

@MainActor
func manageSubscriptions() async {
    if let windowScene = UIApplication.shared.connectedScenes.first {
        do {
            try await AppStore.showManageSubscriptions(in: windowScene as! UIWindowScene)
        } catch {
            //error
        }
    }
}

score 0 · Answer 2 · answered Nov 17 '22 at 16:11

You can conversely use the view modifier manageSubscriptionsSheet(isPresented:) instead. This is Apple's recommended approach when using SwiftUI and will mitigate the need for getting a reference to the window scene.

Source:

If you’re using SwiftUI, call the manageSubscriptionsSheet(isPresented:)view modifier.

SwiftUI - How to get access to "WindowScene"

2 Answers2