如何在 SWIFT 中以编程方式将我的自定义控制器变成根控制器？ （无法加载 NIB）

Posted 2023-02-26

【中文标题】如何在 SWIFT 中以编程方式将我的自定义控制器变成根控制器？ （无法加载 NIB）

【英文标题】：How to turn my custom controller into root controller programmatically in SWIFT? (Could not load NIB)

【发布时间】：2021-08-26 16:27:42

【问题描述】：

我在没有 StoryBoard 的 ios 14 中动态创建了一个 XCode 项目。 HomeViewController 是我的自定义类。我收到此错误：

*** 由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序，原因：“无法在包中加载 NIB：'NSBundle with name 'HomeViewController'”

这是我的场景代理类：

class SceneDelegate: UIResponder, UIWindowSceneDelegate 

    var window: UIWindow?


    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) 
        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
        guard let windowScene = (scene as? UIWindowScene) else  return 
        
        window = UIWindow(frame: windowScene.coordinateSpace.bounds)
        window?.windowScene = windowScene
        window?.rootViewController = HomeViewController(nibName: "HomeViewController", bundle: nil)
        window?.makeKeyAndVisible()
    

【问题讨论】：

只需像HomeViewController() 一样初始化视图控制器就可以了

【参考方案1】：

不要像这样初始化你的视图控制器：

window?.rootViewController = HomeViewController(nibName: "HomeViewController", bundle: nil)

像这样初始化它：

window?.rootViewController = HomeViewController()

这是因为当您指定 nibName 时，iOS 认为您正在尝试从 Storyboard 或其他地方进行初始化。

完成代码：

class SceneDelegate: UIResponder, UIWindowSceneDelegate 

    var window: UIWindow?


    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) 
        // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
        // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
        // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
        guard let windowScene = (scene as? UIWindowScene) else  return 
        
        window = UIWindow(frame: windowScene.coordinateSpace.bounds)
        window?.windowScene = windowScene
        window?.rootViewController = HomeViewController()
        window?.makeKeyAndVisible()