在SwiftUI中有没有一种方法可以根据环境变量来改变视图？

struct AppThemeKey: EnvironmentKey {
    static let defaultValue: AppTheme = .light
}

extension EnvironmentValues {
    var appTheme: AppTheme {
        get { self[AppThemeKey.self] }
        set { self[AppThemeKey.self] = newValue }
    }
}

struct ContentView: View {
    @Environment(\.appTheme) var appTheme
    
    var body: some View {
        VStack {
            Text("Hello, World!")
                .foregroundColor(appTheme == .light ? .black : .white)
                .background(appTheme == .light ? .white : .black)
        }
    }
}

@main
struct MyApp: App {
    @StateObject private var appTheme = AppTheme.light
    
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environment(\.appTheme, appTheme)
        }
    }
}