CoordinatorExample.swift

import UIKit

protocol Coordinator {
    func start()
}

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    private lazy var applicationCoordinator: ApplicationCoordinator = {
        return ApplicationCoordinator(window: self.window!)
    }()

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        window = UIWindow(frame: UIScreen.mainScreen().bounds)
        applicationCoordinator.start()
        return true
    }
}

class ApplicationCoordinator: Coordinator {

    let window: UIWindow
    let rootViewController: UITabBarController

    let wordsNavigationController: UINavigationController
    let phrasesNavigationController: UINavigationController

    let wordsCoordinator: WordsCoordinator
    let phrasesCoordinator: PhrasesCoordinator

    init(window: UIWindow) {
        self.window = window
        self.rootViewController = UITabBarController()
        self.wordsNavigationController = UINavigationController()
        self.phrasesNavigationController = UINavigationController()
        self.rootViewController.setViewControllers([wordsNavigationController, phrasesNavigationController], animated: false)
        self.wordsCoordinator = WordsCoordinator(presenter: wordsNavigationController)
        self.phrasesCoordinator = PhrasesCoordinator(presenter: phrasesNavigationController)
    }

    func start() {
        window.rootViewController = rootViewController
        window.tintColor = Color.oranje
        wordsCoordinator.start()
        phrasesCoordinator.start()
        window.makeKeyAndVisible()
    }
}

class WordsCoordinator: Coordinator {

    let presenter: UINavigationController

    private let listViewController: ListViewController<Word>
    private let dataSource: WordsDataSource

    init(presenter: UINavigationController) {
        self.presenter = presenter
        self.presenter.navigationBar.translucent = false
        self.dataSource = WordsDataSource()
        self.listViewController = ListViewController<Word>()
        self.listViewController.title = "Words"
        self.listViewController.items = dataSource.words
        self.listViewController.configureCell = { cell, item in
            cell.item = item
        }
        self.listViewController.didSelectItem = { item in
            presenter.pushViewController(WordViewController(word: item), animated: true)
        }
    }

    func start() {
        presenter.pushViewController(listViewController, animated: false)
    }
}