如何给barbuttonitem行动？

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let button = UIButton(type: .system)
        button.setTitle("Click Me", for: .normal)
        button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
        button.titleLabel?.font = UIFont.systemFont(ofSize: 16)
        view.addSubview(button)
    }

    @objc func buttonTapped() {
        print("Button was tapped!")
    }
}