Ios/swift/ナビゲーションバー/右上にボタンを追加

サンプル

   override func viewDidLoad() {
       super.viewDidLoad()
       let rightFavoriteBarButtonItem: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Search, target: self, action: #selector(self.favoriteButtonTapped))
       self.navigationItem.setRightBarButtonItems([rightFavoriteBarButtonItem], animated: true)
   }
   func favoriteButtonTapped() {
   }