ViewControllerLifecycle.swift

//
//  ViewController.swift
//  LifeCycleDelegate
//
//  Created by Davide Mendolia on 30/01/2018.
//  Copyright © 2018 Karumi. All rights reserved.
//

import UIKit

protocol ViewControllerLifecycle {
}

@objc protocol ViewControllerLifecycleObserver {
    @objc optional func viewDidLoad()
    @objc optional func viewWillAppear()
    @objc optional func viewDidAppear()
    @objc optional func viewWillDisappear()
    @objc optional func viewDidDisappear()
}

class BaseViewControllerWithLifecycleDelegate: UIViewController {
    var lifecycleDeletage: ViewControllerLifecycleObserver?

    override func viewDidLoad() {
        super.viewDidLoad()
        lifecycleDeletage?.viewDidLoad?()
    }

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

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

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

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

class Presenter: ViewControllerLifecycleObserver {
    func viewDidLoad() {
        print("Trigger on view did load")
    }
}

func provideViewController() -> UIViewController {
    let vc = BaseViewControllerWithLifecycleDelegate()
    vc.lifecycleDeletage = Presenter()
    return vc
}

Where can I see an example you apply?