如何在异步调用 SwiftUI 后加载初始屏幕

Question

在 AppDelegate class 中，我正在调用 Auth API 并且它 returns 令牌。然后我在 UserDefaults 中设置令牌。然而此时我的 HomeView 正在打开，它的 .onAppear{} 函数调用另一个 api。我想等待 Auth API 结果的完成。之后要打开 HomeView。我该怎么做？

这也是授权或获取令牌的正确方式吗？

这是我的 AppDelegate、服务、HomeView：

class AppDelegate: UIResponder, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        Service.shared.authorize(userName: "username", password: "password") { (response) in
            UserDefaults.standard.set(response.token, forKey: "Token")     
        } 
        return true
    }

class Service {
   func authorize(userName: String, password: String, completion: @escaping(AuthResponse>) -> ()) {
        // Here I'm calling auth api
        callApiAsync(urlRequest: urlRequest) { (apiResponse) in
            completion(apiResponse)
        }
    }
}

struct HomeView: View {
    @ObservedObject var vm = HomeViewModel()
    var body: some View {
        Text("HomeView")
        .onAppear {
            self.vm.getList() { response in
                
            }
        }
    }
}

Answer 1

我不知道你在哪里初始化你的UIWindow。 AppDelegate / SceneDelegate
我的 SceneDelegate 样本与 AppDelegate 相似。

请求完成后初始化您的window。

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    Service.shared.authorize(userName: "username", password: "password") { (response) in
        UserDefaults.standard.set(response.token, forKey: "Token")     
        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)
            window.rootViewController = UIHostingController(rootView: HomeView())
            self.window = window
            window.makeKeyAndVisible()
        }
    } 
}

如何在异步调用 SwiftUI 后加载初始屏幕

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ios

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swift

swiftui