Adding a UIBarButtonItem programmatically

Question

I'm trying to add a UIBarButtonItem programmatically.

let navigation = UINavigationController()
let rightBarButton = UIBarButtonItem(title: "LogIn", style: .plain, target: self, action: #selector(logInPressed))
navigation.navigationItem.rightBarButtonItem = rightBarButton

And also made a selector function for testing.

@objc func logInPressed() {
   print("go to login")
}

Unfortunately that does not work - bar button is not visible on navigation bar in simulator.

Checked with a breakpoint, rightBarButtonItem exists.

Probably issue can be caused by creating bar button from app coordinator, not from child VC.

Could please anyone help to troubleshoot this issue? Simulator screenshot

Could you please expand on your question and explain what you are having trouble with? — Lennart, Dec 25 '19 at 21:21
@LennartHase I'm having a problem with having right navigation bar visible on a navigation bar in simulator. — botichelli, Dec 25 '19 at 21:26

score 1 · Accepted Answer · answered Dec 25 '19 at 21:53

you are adding UIBarButtonItem to a new instance of NavigationController. so it will not appear there.

so in your view controller which you want to handle right navigation bar , under one of these methods: override func viewDidLoad() or override func viewWillAppear

add:

let rightBarButton = UIBarButtonItem(title: "LogIn", style: .plain, target: self, action: #selector(logInPressed))

self.navigationController?.navigationItem.setRightBarButton(rightBarButton, animated: true)

score 0 · Answer 2 · answered Dec 25 '19 at 21:39

0

Issue was caused by creating bar button not from child VC, but coordinator.

Bar buttons are stored in navigationItem property of UIViewController.

answered Dec 25 '19 at 21:39

botichelli

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Adding a UIBarButtonItem programmatically

2 Answers2