Generambaのswift_viperテンプレートで起こりうるクラッシュ

gistfile1.swift

class RootViewController: UIViewController {
  override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = .red
  }
  
  override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    let vc = ViewController.make()
    present(vc, animated: true, completion: nil)
  }
}

class ViewController: UIViewController {
  var output: Presenter!
  
  static func make() -> ViewController {
    let vc = ViewController()
    let interactor = Interactor()
    let presenter = Presenter()
    presenter.interactor = interactor
    presenter.view = vc
    interactor.output = presenter
    vc.output = presenter
    return vc
  }
  
  override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = .blue
    output.viewDidLoad()
  }
  
  func changeBackgroundColor() {
    view.backgroundColor = .green
  }
  
  override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    dismiss(animated: true, completion: nil)
  }
}

class Presenter {
  weak var view: ViewController!
  var interactor: Interactor!
  
  func viewDidLoad() {
    interactor.request()
  }
  
  func didReceivedResponse() {
    view.changeBackgroundColor()
  }
}

class Interactor {
  weak var output: Presenter!
  
  func request() {
    DispatchQueue.main.asyncAfter(deadline: .now() + 3.0) { [weak self] in
      self?.output.didReceivedResponse()
    }
  }
}