Swift — How to implement left or right bar button item programatically.

In this article, I would like to show you how to implement left or right bar button item programatically.

override func viewDidLoad() {
super.viewDidLoad()
  let image = UIImage(named: "close_button")
  let barButtonItem = UIBarButtonItem(image: image, style: .plain, target: self, action: #selector(closeButtonClicked(_:)))
   navigationItem.rightBarButtonItem = barButtonItem
  // or
   navigationItem.leftBarButtonItem = barButtonItem
}

and handleButtonClicked

@objc func closeButtonClicked(_ sender: UIBarButtonItem) {
   // handle your code...
}