https://medium.com/p/22f82c073165

Controller.swift

import UIKit

class Controller<RootViewType: IView>: UIViewController {

    var rootView: RootViewType! {
        return view as? RootViewType
    }

    // MARK: - View Life Cycle

    override func loadView() {
        view = RootViewType(frame: UIScreen.main.bounds)
        view.setNeedsLayout()
        view.layoutIfNeeded()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        rootView.viewWillAppear(animated)
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        rootView.viewDidAppear(animated)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        rootView.viewWillDisappear(animated)
    }

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        rootView.viewDidDisappear(animated)
    }
}