generic-rootvc.swift

import UIKit
import GenericViewKit

class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    private let applicationController = ApplicationController()

    func application(application: UIApplication,
                     didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        applicationController.configureReporting()

        configureWindow()

        return true
    }

    private func configureWindow() {
        window = UIWindow(frame: UIScreen.mainScreen().bounds)
        window?.rootViewController = applicationController.rootViewController
        window?.makeKeyAndVisible()
    }
}

class RootViewController: GenericViewController<GenericView> {
    private(set) unowned var applicationController: ApplicationController
    private(set) var mainViewController: UIViewController?

    init(applicationController: ApplicationController) {
        self.applicationController = applicationController

        super.init()
    }

    func configureMainViewController(viewController: UIViewController) {
        if let mainViewController = self.mainViewController {
            mainViewController.view.removeFromSuperview()
            mainViewController.removeFromParentViewController()
        }

        mainViewController = viewController

        mainViewController?.willMoveToParentViewController(self)
        addChildViewController(viewController)
        view.addSubview(viewController.view)
        mainViewController?.didMoveToParentViewController(self)

        viewController.view.setEdgesEqualToSuperview()
    }
}