How add tabs programmatically in UITabBarController with swift?

UPDATE SWIFT 5

One example of how to create an UITabBarController programmatically could be like this:

First we create the UIViewControllers that will be the content for each tab of the tab bar interface. For this example we only create one very simple.

class Item1ViewController: UIViewController {    override func viewDidLoad() {        super.viewDidLoad()        view.backgroundColor = UIColor.green        self.title = "item1"        print("item 1 loaded")    }}

Now, the UITabBarController:

We create the new instances of the UIViewControllers that we want to display in the tab bar. Then we create an icon for each instance we have created and then we create an array that contains all UIViewControllers that specify the content for each tab of the tab bar interface. The order of the view controllers in the array corresponds to the display order in the tab bar.

class DashboardTabBarController: UITabBarController, UITabBarControllerDelegate {    override func viewDidLoad() {        super.viewDidLoad()        delegate = self    }    override func viewWillAppear(_ animated: Bool) {        super.viewWillAppear(animated)        let item1 = Item1ViewController()        let icon1 = UITabBarItem(title: "Title", image: UIImage(named: "someImage.png"), selectedImage: UIImage(named: "otherImage.png"))        item1.tabBarItem = icon1        let controllers = [item1]  //array of the root view controllers displayed by the tab bar interface        self.viewControllers = controllers    }    //Delegate methods    func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {        print("Should select viewController: \(viewController.title ?? "") ?")        return true;    }}

If you are using storyboard for the viewcontrollers then you have to write like this in your tabbarcontroller class.

class CustomTabbarController : UITabBarController {    override func viewDidLoad() {        super.viewDidLoad()        let storyboard = UIStoryboard(name: "Main", bundle: nil)        let firstViewController = FirstViewController()        let navigationController = UINavigationController(rootViewController: firstViewController)        navigationController.title = "First"        navigationController.tabBarItem.image = UIImage.init(named: "map-icon-1")       viewControllers = [navigationController]        if let secondViewController = storyboard.instantiateViewController(withIdentifier: "SecondViewController") as? SecondViewController {            let navgitaionController1 = UINavigationController(rootViewController: secondViewController)            navgitaionController1.title = "Second"            navgitaionController1.tabBarItem.image = UIImage.init(named: "second-icon-1")            var array = self.viewControllers            array?.append(navgitaionController1)            self.viewControllers = array        }    }}

    private lazy var tabbarViewController: UITabBarController = {            let tabbarViewController = UITabBarController()            tabbarViewController.setViewControllers([startVC,                                                     offerVC,                                                     benefitsVC,                                                     shopVC,                                                     recipesVC], animated: true)                        return tabbarViewController        }()window?.rootViewController = tabbarViewController