Change the font of a UIBarButtonItem

Question

I have a UIBarButtonItem in my UIToolbar titled

Answer 1

Throughout App:

if let font = UIFont(name: "AvenirNext-DemiBold", size: 15) {
        UIBarButtonItem.appearance().setTitleTextAttributes([NSFontAttributeName: font,NSForegroundColorAttributeName:TOOLBAR_TITLE_COLOR], forState: UIControlState.Normal)

    }