DependencyInjection.swift

import RxFlow
import UIKit

class WatchedFlow: Flow {

    ...
    private let service: MoviesService

    init(withService service: MoviesService) {
        self.service = service
    }
    ...
    private func navigateToMovieListScreen () -> [NextFlowItem] {
        // inject Service into ViewModel
        let viewModel = WatchedViewModel(with: self.service)

        // injecy ViewMNodel into UIViewController
        let viewController = WatchedViewController.instantiate(with: viewModel)

        viewController.title = "Watched"
        self.rootViewController.pushViewController(viewController, animated: true)
        return [NextFlowItem(nextPresentable: viewController, nextStepper: viewModel)]
    }
    ...
}