EnvironmentValuesが大域変数ではないことを示すサンプルコード2

nvironmentValuesSample2.swift

import SwiftUI

extension EnvironmentValues {
    @Entry var customStringValue = "Goodbye, world!"
}

struct ContentView: View {
    var body: some View {
        RepRepresentable()
            .environment(\.customStringValue, "Hello, world!")
    }
}

struct FooView: View {
    @Environment(\.customStringValue) var customValue: String
    var action: () -> Void

    var body: some View {
        VStack {
            Button(customValue, action: action)
                .font(.largeTitle.bold())
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .background(.background)
    }
}

struct RepRepresentable: UIViewControllerRepresentable {
    func makeUIViewController(context: Context) -> ViewController {
        ViewController()
    }

    func updateUIViewController(_: ViewController, context: Context) {}
}

final class ViewController: UIViewController {
    override func loadView() {
        view = UIHostingConfiguration {
            FooView { [weak self] in
                self?.present(ViewController(), animated: true)
            }
        }
        .margins(.all, EdgeInsets())
        .makeContentView()
    }
}

#Preview {
    ContentView()
}