与UINavigationController斗争

Question

由于UINavigationController拒绝显示任何标题，甚至拒绝显示titleView，BackItem？.title，所有内容都无法正常工作，我一直在苦苦挣扎。我可以在顶部看到导航栏，只是空白。这是我的代码：

class tab1_main: UIViewController {
    var main_nav_controller = UINavigationController()
    override func viewDidLoad() {
        main_nav_controller.navigationBar.backItem?.title = "Hello" //NO LUCK
        main_nav_controller.navigationBar.topItem?.title = "Hello" //NO LUCK
        main_nav_controller.title = "Hello" //NO LUCK
        self.title = "Hello" //NO LUCK
        navigationItem.title = "Hello" //NO LUCK

        view.addSubview(main_nav_controller.view)
        tab1_startup()
    }
}

Answer 1

你去。 :)我希望它会有所帮助。

// Set up the title
self.navigationItem.title = "Title"
/// if you want to use large title then set true to use large title into small title if scroll down.
self.navigationController?.navigationBar.prefersLargeTitles = true