Setting up the Foundation with UITabBarController

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To kick off our project, we'll go ahead and implement the foundation of our application by building a custom UITabBarController. This will be a very straightforward lesson where we create our tab bar controller subclass, along with importing the proper icon images into our project. Once we set this up, we'll be in a good position to build out our first list using a UICollectionViewController in the next lesson.

Xcode 11.3+ SceneDelegate Update 4/20/2020

As most of you are probably aware by now, starting with Xcode 11.3, Single View Application projects are now created with a SceneDelegate file. This file is used to manange the scenes in your application and thus also contains the entry point of your app. Because of this change, we'll need to go about setting up our project using SceneDelegate instead of AppDelegate. More specifically, you want to leave AppDelegate alone and instead make the following changes in SceneDelegate:

class SceneDelegate: UIResponder, UIWindowSceneDelegate {    var window: UIWindow?        func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {        if let windowScene = scene as? UIWindowScene {            let window = UIWindow(windowScene: windowScene)            window.rootViewController = MainTabBarController()            self.window = window window.makeKeyAndVisible()        }    }}