ViewController

import UIKit

class ViewController: UIViewController {

    // Define identifier
    let notificationName2 = Notification.Name("Did selected language")

    var language = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()
        language = ["English", "Japanese", "Thái Lan", "Indonesia", "Việt Nam"]
    }

    @IBAction func changeLanguage(_ sender: Any) {
        var actionSheet = UIAlertController(title: "Language", message: "Select language", preferredStyle: .actionSheet)
        actionSheet.addAction(UIAlertAction(title: "Huỷ", style: .cancel, handler: {(_ action: UIAlertAction) -> Void in
            // Cancel button tappped.
            self.dismiss(animated: true, completion: {() -> Void in })
        }))
        for item: String in language {
            print("Mao ", item)
            actionSheet.addAction(UIAlertAction(title: item, style: .default, handler: {(_ action: UIAlertAction) -> Void in
                var langCode = Language.getLanguageCode(item)
                Language.setLanguage(langCode)

                // Post notification
                NotificationCenter.default.post(name: BaseUIView.notificationName, object: nil)

                self.dismiss(animated: true, completion: {() -> Void in })
            }))
        }
    self.present(actionSheet, animated: true, completion: { _ in })
    }

}