swift - 使用 Swift 以编程方式创建的 UIBarButtonItem，不可见

Question

我不确定为什么这段应该在导航 Controller 的工具栏中嵌入两个栏按钮项的代码不起作用。当我运行我的代码时，工具栏本身是可见的，但不是栏按钮项。我在这里做错了什么？感谢关注。

class NavigationController: UINavigationController {

    override func viewDidLoad() {
        super.viewDidLoad()

        //Tool bar appearance
        toolbar.barTintColor = UIColor.blackColor()


        //Show tool bar by default
        self.navigationController?.toolbarHidden = false

        //Icons all located in images.xcassets
        let homeImage = UIImage(named: "home")
        let gameImage = UIImage(named: "logo")

        var toolBarItems = [UIBarButtonItem]()

        let homeButton = UIBarButtonItem(image: homeImage, style: UIBarButtonItemStyle.Plain, target: self, action: #selector(NavigationController.toHome))
        homeButton.title = "Home"


        let gameButton = UIBarButtonItem(image: gameImage, style: UIBarButtonItemStyle.Plain, target: self, action: #selector(NavigationController.toGame))
        homeButton.title = "Game"

        //Place the bar items in toolBarItems array
        toolBarItems.append(homeButton)
        toolBarItems.append(gameButton)

        //self.toolbar.items = toolBarItems
        self.toolbar.setItems(toolBarItems, animated: true)

    }//End viewDidLoad


    func toHome() {
        let homeVC = HomeViewController(nibName: "HomeViewController", bundle: nil)
        self.pushViewController(homeVC, animated: true)
    }

    func toGame() {
        let gameVC = GameViewController(nibName: "GameViewController", bundle: nil)
        self.pushViewController(gameVC, animated: true)
    }

}

Answer 1

您是否为您的依赖 Controller 创建了第二个 .swift 文件？您应该将这段代码移动到依赖的 Controller 文件中

self.navigationController?.toolbarHidden = false

    let button1 = UIBarButtonItem(title: "home", style: .Plain, target: self, action: #selector(SecondViewController.home))

    let myToolBar = [button1]

    self.setToolbarItems(myToolBar, animated: true)