LifecycleObserver with Notification

ViewController.swift

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

import UIKit


@objc protocol ViewControllerLifecycleObserver2 {
    @objc optional func viewDidLoad()
    @objc optional func viewWillAppear()
    @objc optional func viewDidAppear()
    @objc optional func viewWillDisappear()
    @objc optional func viewDidDisappear()
}

class BaseViewControllerWithLifecycleNotification: UIViewController {
    var lifecycleDeletage: ViewControllerLifecycleObserver?

    override func viewDidLoad() {
        super.viewDidLoad()
        NotificationCenter.default.post(name: NSNotification.Name.ViewDidLoad, object: self)
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        NotificationCenter.default.post(name: NSNotification.Name.ViewWillAppear, object: self)
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        NotificationCenter.default.post(name: NSNotification.Name.ViewDidAppear, object: self)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        NotificationCenter.default.post(name: NSNotification.Name.ViewWillDisappear, object: self)
    }

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        NotificationCenter.default.post(name: NSNotification.Name.ViewDidDisappear, object: self)
    }
}

class Presenter2: ViewControllerLifecycleObserver2 {
    func viewDidLoad() {
        print("Trigger on view did load")
    }
}

extension NSNotification.Name {
    static let ViewDidLoad = Notification.Name("ViewDidLoad")
    static let ViewWillAppear = Notification.Name("viewWillAppear")
    static let ViewDidAppear = Notification.Name("viewDidAppear")
    static let ViewWillDisappear = Notification.Name("viewWillDisappear")
    static let ViewDidDisappear = Notification.Name("viewDidDisappear")
}

func provideViewController() {
    let vc = BaseViewControllerWithLifecycleNotification()
    let presenter = Presenter2()
    presenter.bind(to: vc)
}

extension ViewControllerLifecycleObserver2 {
    func bind(to vc: BaseViewControllerWithLifecycleNotification) {
        NotificationCenter.default.addObserver(
            self, selector:
            #selector(ViewControllerLifecycleObserver.viewDidLoad),
            name: NSNotification.Name.ViewDidLoad,
            object: vc
        )
        NotificationCenter.default.addObserver(
            self, selector:
            #selector(ViewControllerLifecycleObserver.viewWillAppear),
            name: NSNotification.Name.ViewWillAppear,
            object: vc
        )
        NotificationCenter.default.addObserver(
            self, selector:
            #selector(ViewControllerLifecycleObserver.viewDidAppear),
            name: NSNotification.Name.ViewDidAppear,
            object: vc
        )
        NotificationCenter.default.addObserver(
            self, selector:
            #selector(ViewControllerLifecycleObserver.viewWillDisappear),
            name: NSNotification.Name.ViewWillDisappear,
            object: vc
        )
        NotificationCenter.default.addObserver(
            self, selector:
            #selector(ViewControllerLifecycleObserver.viewDidDisappear),
            name: NSNotification.Name.ViewDidDisappear,
            object: vc
        )
    }
}

Where can I see an example you apply?