How to load initial screen after an async call SwfitUI - ios

Question

In AppDelegate class I'am calling Auth API and it returns token. And then I set the token in UserDefaults.
However at this time also my HomeView is opening and its .onAppear{} function calling another api. I want to wait completion of Auth API result. After that want to open HomeView. How can I do that?
Also is this the right way for Authorization or getting token?
Here is my AppDelegate, Service, 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

I do not know where you initialize your UIWindow. AppDelegate / SceneDelegate
My sample for the SceneDelegate but AppDelegate will be similar.
Initialize your window after the request completed.
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()
}
}
}