I am trying to display a title bar, an image, and then two buttons, almost as shown below. The main differences are that I want the two element buttons to be 50% wide, and each one to be solid color (occupying the entire bottom of the screen). I do not use the tab bar, because buttons are just about changing the image, not the entire view controller.

While using the storyboard, I just got stuck on the buttons. I have them on the toolbar as toolbar items. Then I tried to set their width in the controller:
@IBOutlet weak var firstButton: UIBarButtonItem!
@IBOutlet weak var secondButton: UIBarButtonItem!
override func viewDidLoad() {
super.viewDidLoad()
self.firstButton.width = self.view.bounds.width / 2
self.secondButton.width = self.view.bounds.width / 2
}

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iOS, . , , , iPhone.