// MARK: - The `User` struct

struct User: Equatable {

    /// The user's name.
    var name: String

    /// The user's username.
    var username: String

    init(name: String, username: String) {
        self.name = name
        self.username = username
    }
}

func ==(lhs: User, rhs: User) -> Bool {
    return lhs.name == rhs.name &&
           lhs.username == rhs.username
}

// MARK: - A sample view controller for the user

class UserViewController: UIViewController {

    @IBOutlet weak var nameLabel: UILabel!
    @IBOutlet weak var usernameLabel: UILabel!

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

// MARK: - A sample tab bar controller

class TabBarController: UITabBarController {

    // Create a list of users
    let users: [User] = [User(name: "Joe", username: "@joe34"),
                         User(name: "Bob", username: "@bob123"),
                         User(name: "Gus", username: "@__gus__")]

    override func viewDidLoad() {
        super.viewDidLoad()

        var views: [UserViewController] = []

        for user in self.users { // Iterate over the users
            let vc = self.storyboard?.instantiateViewController(withIdentifier: "UserViewController") as! UserViewController // Create a new view controller from the storyboard
            vc.loadViewIfNeeded() // This waits for the view controller to initialize
            vc.tabBarItem = UITabBarItem(title: user.name, image: nil, tag: self.users.index(of: user)!) // the `image` is nil, but you can fill it in later if need be.
            vc.nameLabel.text = user.name
            vc.usernameLabel.text = user.username
            views.append(vc) // Add this view controller to the list
        }

        self.viewControllers = views // Assigns the list of view controllers to the tab bar, where they will be displayed
    }
}