Generambaのswift_viperテンプレートでクラッシュするパターン

gistfile1.swift

//
//  ViewController.swift
//  ViperAsyncIssue
//
//  Created by Tomoya Hirano on 2019/09/27.
//  Copyright © 2019 Tomoya Hirano. All rights reserved.
//

import UIKit

class RootViewController: UIViewController {
  let button: UIButton = .init(type: .custom)
  
  override func loadView() {
    super.loadView()
    button.setTitle("present", for: .normal)
    button.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(button)
    NSLayoutConstraint.activate([
      button.topAnchor.constraint(equalTo: view.topAnchor),
      button.rightAnchor.constraint(equalTo: view.rightAnchor),
      button.leftAnchor.constraint(equalTo: view.leftAnchor),
      button.bottomAnchor.constraint(equalTo: view.bottomAnchor),
    ])
  }
  
  override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = .red
    button.addTarget(self, action: #selector(onTap), for: .touchUpInside)
  }
  
  @objc func onTap(_ sender: UIButton) {
    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!
  let value: Int = 0
  
  func request() {
    lock()
    let _value = value
    DispatchQueue.main.asyncAfter(deadline: .now() + 3.0) { [weak self] in
      print(_value)
      self?.output.didReceivedResponse()
    }
  }
  
  func lock() {
    DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {
      print(self)
    }
  }
}

lockでselfが保持されるが、outputは解放されているのでself?.outputはForce Unwrapでクラッシュする