与 UINavigationController 斗争

Question

我与 UINavigationController 纠缠了好几个小时，因为它拒绝显示任何标题甚至 titleView、BackItem?.title，一切都不起作用。我可以看到顶部的导航栏，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

给你。 :) 希望对您有所帮助。

// 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

Answer 2

将 tab1_main viewController 放在 navigationController 视图堆栈的底部，而不是在 tab1_main 视图控制器中创建一个 navigationController。

    let tab1_main = UIViewController()
    let main_nav_controller = UINavigationController(rootViewController: tab1_main)

与 UINavigationController 斗争

Struggle with UINavigationController

ios

swift

navigation

uinavigationcontroller

uinavigationbar