How to add multiple UIBarButtonItems on right side of Navigation Bar?

Use this in swift:

override func viewDidLoad() {
  super.viewDidLoad()

  let editImage    = UIImage(named: "plus")!
  let searchImage  = UIImage(named: "search")!

  let editButton   = UIBarButtonItem(image: editImage,  style: .Plain, target: self, action: "didTapEditButton:")
  let searchButton = UIBarButtonItem(image: searchImage,  style: .Plain, target: self, action: "didTapSearchButton:")

  navigationItem.rightBarButtonItems = [editButton, searchButton]
}

Write the action functions like this:

func didTapEditButton(sender: AnyObject){
    ...
}

func didTapSearchButton(sender: AnyObject){
    ...
}

Swift 4 & 5

    override func viewDidLoad() {
        super.viewDidLoad()
        let editImage    = UIImage(named: "edit")!
        let searchImage  = UIImage(named: "search")!

        let editButton   = UIBarButtonItem(image: editImage,  style: .plain, target: self, action: #selector(didTapEditButton(sender:)))
        let searchButton = UIBarButtonItem(image: searchImage,  style: .plain, target: self, action: #selector(didTapSearchButton(sender:)))

        navigationItem.rightBarButtonItems = [editButton, searchButton]
    }

    @objc func didTapEditButton(sender: AnyObject){

    }

    @objc func didTapSearchButton(sender: AnyObject){

    }