UIToolbar with bar buttons using a custom font using Swift 3

Toolbar.swift

        if let nav = navigationController {
            
            nav.setToolbarHidden(false, animated: false)
            
            // doesn't really set the button's tint
            UIToolbar.appearance().tintColor = UIColor.black
            
            // instead of setting the text color of each bar button
            UIBarButtonItem.appearance().tintColor = UIColor.black
            
            
            //http://www.fileformat.info/info/unicode/char/26ed/index.htm
            let settingsButton = UIBarButtonItem(title: "\u{2699}",
                                                 style: .plain,
                                                 target: self,
                                                 action: #selector(TracksViewController.settings))
            
            
            // set the font for all bar buttons along with the foreground color
            if let font = UIFont(name: "Helvetica", size: 22) {
                UIBarButtonItem.appearance().setTitleTextAttributes(
                    [NSFontAttributeName: font,
                     NSForegroundColorAttributeName:UIColor.black // will override toolbar tint
                    ],
                    for: UIControlState.normal)
                
                // to set just an individual button
                // settingsButton.setTitleTextAttributes([NSFontAttributeName: font], for: UIControlState.normal)
            }
            
            // or to get the default font and size
            //let font = UIFont.systemFont(ofSize: UIFont.labelFontSize)
            
            let peace = UIBarButtonItem(title: "\u{262E}",
                                        style: .plain,
                                        target: self,
                                        action: #selector(TracksViewController.settings))
            
            // from the musical symbol block looks good
            let eighth = UIBarButtonItem(title: "\u{1D160}",
                                         style: .plain,
                                         target: self,
                                         action: #selector(TracksViewController.settings))
            toolbarItems = [settingsButton,peace, eighth]
            
            // or
            self.navigationItem.setRightBarButtonItems([settingsButton, peace, eighth], animated: true)
            self.navigationItem.setLeftBarButtonItems([settingsButton, peace, eighth], animated: true)
        }