EnvironmentObject for UIKit MVVM Architecture

Question

I used to make apps in swiftUI and now I'm making an app in UIKit with MVVM architecture.

In SwiftUI. There is a property wrapper called @EnviormentObject that allows you to access a class anywhere in the app.

I want to integrate a viewModel that is initialized in the SceneDelegate and can be accessed from anywhere in the app without needing to reinitialize the class.

An example would be to watch the current user and if its state changes to nil, present a notification to the user. But for that it needs to be a class that is only inited once so it doesn't have to load the data every time it is called.

How can I integrate a class that is inited in SceneDelegate and can be accessed from anywhere in the app?

Thanks.

@jnpdx How can I integrate a class that is inited in SceneDelegate and can be accessed from anywhere in the app? — Santiago Padilla, Jul 11 '23 at 16:19
You use a singleton. Your class should declared a static var usually named shared that is of class type. Initialised once and can be used by any other object. — Ptit Xav, Jul 11 '23 at 16:21
@SantiagoPadilla Does this answer your question? https://stackoverflow.com/questions/67439842/how-to-create-a-singleton-that-i-can-update-in-swiftui — jnpdx, Jul 11 '23 at 16:30
Use Dependecy Injection, you can’t use SwiftUI wrappers in UIKit — lorem ipsum, Jul 19 '23 at 18:30

score 0 · Answer 1 · answered Jul 19 '23 at 18:16

0

Don't use MVVM in UIKit, it's better to use child view controllers and the responder chain.

You can call a method in your view controller that will automatically work its way up to the scene delegate without needing to pass a reference down.

answered Jul 19 '23 at 18:16

malhal

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EnvironmentObject for UIKit MVVM Architecture

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