uinavigationContoller（rootviewController：viewController（））scenedelegate xcode 15.0通过编程方式

Question

我无法在屏幕上获得结果。 在此处输入图像描述 这是我在SceneDelegate SceneDelegate内部的代码的示例

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

   var window: UIWindow?
   
   func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    guard let windowScene = (scene as? UIWindowScene) else { return }
    window = UIWindow(frame: windowScene.coordinateSpace.bounds)
    window?.windowScene = windowScene
    window?.rootViewController = UINavigationController(rootViewController: ViewController())
    window?.makeKeyAndVisible()
   }
}

不幸的是，我无法获得预期的结果。 在此处输入图像描述 请帮助我了解SceneDelegate内部使用UinavController制作应用程序的结构。我正在学习只能以编程方式而没有故事板 Xcode的版本为15.0

Answer 1

 func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let scene = (scene as? UIWindowScene) else { return }
        window = UIWindow(windowScene: scene)
        window?.overrideUserInterfaceStyle = .light // for light mode supported only 
        window?.rootViewController = BaseNavigationController(rootViewController: ViewController())
        window?.makeKeyAndVisible()
    }

基本导航controller是

import UIKit

class BaseNavigationController: UINavigationController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        if #available(iOS 15.0, *) {
            let navigationBarAppearance = UINavigationBarAppearance()
            navigationBarAppearance.configureWithDefaultBackground()
            navigationBarAppearance.backgroundImage = UIImage(named: "NavBarBg") // if wanna add bg image 
            navigationBarAppearance.backgroundColor = .white // white bar color
            
            UINavigationBar.appearance().standardAppearance = navigationBarAppearance
            UINavigationBar.appearance().compactAppearance = navigationBarAppearance
            UINavigationBar.appearance().scrollEdgeAppearance = navigationBarAppearance
            navigationBar.tintColor = .white
            navigationBar.isTranslucent = false
        }
    }
}