(iOS) - SwiftUI with VIP

SwiftUIWithVIP.swift

import SwiftUI

@main
struct MyMainApp: App {
    var body: some Scene {
        WindowGroup {
            MainView.build()
        }
    }
}

// MARK: - File - MainView.swift
import SwiftUI

struct MainView: View {
    @ObservedObject private var viewModel: MainViewModel
    private var interactor: MainInteractor
        
    var body: some View {
        Text(viewModel.message).onAppear {
            self.interactor.updateMessage()
        }
    }

    static func build() -> some View {
        let presenter = MainPresenter()
        let interactor = MainInteractor(presenter: presenter)

        return MainView(viewModel: presenter.viewModel,
                        interactor: interactor)
        }
}

// MARK: - File - MainInteractor.swift
import Foundation

class MainInteractor {
    private var presenter: MainPresentable
    
    init(presenter: MainPresentable) {
        self.presenter = presenter
    }

    func updateMessage() {
        presenter.presentMessage()
    }
}

// MARK: - File - MainPresenter.swift
import Foundation

protocol MainPresentable {
    func presentMessage()
}

class MainPresenter: MainPresentable {

    var viewModel: MainViewModel = MainViewModel()

    func presentMessage() {
        viewModel.message = "Hello"
    }
}

//MARK: - View Model
import SwiftUI

class MainViewModel: ObservableObject {
    @Published var message: String = ""
}