PassEnvironmentObjectApp.swift

class ObservableCounter: ObservableObject {
    @Published var count = 0

    func increment() {
        count += 1
    }
}

@main
struct MyApp: App {

    @ObservedObject var counter = ObservableCounter()

    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(counter)
        }
    }
}