Changing navigation title programmatically

I have a navigation bar with a title. When I double click the text to rename it, it actually says it's a navigation item, so it might be that.

I'm trying to change the text using code, like:

declare navigation bar as navagationbar here
button stuff {
    navigationbar.text = "title"
}

That's not my code obviously, just showing how it would work.

So whenever I press the button, I want the title to change.

You change the title by changing the title of the view controller being displayed:

viewController.title = "some title"

Normally this is done in view did load on the view controller:

override func viewDidLoad() {
    super.viewDidLoad()
    self.title = "some title"
}

However, this only works if you have your view controller embedded in a UINavigationController. I highly recommend doing this instead of creating a navigation bar yourself. If you insist on creating a navigation bar yourself, you can change the title by doing:

navigationBar.topItem.title = "some title"

Try the following in viewDidLoad

self.navigationItem.title = "Your Title"

The code below works for me with Xcode 7:

override func viewDidLoad() {        
    super.viewDidLoad()
    self.navigationItem.title = "Your Title"
}

I found this to work:

navigationItem.title = "Title"