默认 Firebase 应用尚未配置，但 FirebaseApp.configure() 添加到 appdelegate 的 didFinishLaunchingWithOptions 方法

Question

我正在尝试在我的 ios 应用上配置 firebase 云消息传递。 根据 Firebase 文档的说明，我添加了这样的 firebase 配置（appdelegate.swift）

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool { IQKeyboardManager.shared.enable = true

if #available(iOS 10.0, *) {
    UNUserNotificationCenter.current().delegate = self
    
    let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
    UNUserNotificationCenter.current().requestAuthorization(
        options: authOptions,
        completionHandler: { _, _ in }
    )
} else {
    let settings: UIUserNotificationSettings =
        UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
    application.registerUserNotificationSettings(settings)
}

application.registerForRemoteNotifications()

Messaging.messaging().isAutoInitEnabled = true
Messaging.messaging().delegate = self

Messaging.messaging().token { token, error in
    if let error = error {
        print("Error fetching FCM registration token: \(error)")
    } else if let token = token {
        self.fcmId = token
        print("\n My FCM registration token: \(token) \n")
    }
}

FirebaseApp.configure()

//For check update
Siren.shared.wail()

if UserDefaults.standard.value(forKey: "login") as? String == "yes" {
    
    let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
    let nextViewController = storyBoard.instantiateViewController(withIdentifier: "MainViewController") as! MainViewController
    let navigationController = UINavigationController(rootViewController: nextViewController)
    let appdelegate = UIApplication.shared.delegate as! AppDelegate
    appdelegate.window!.rootViewController = navigationController
    self.window?.makeKeyAndVisible()
    
}else{
    
    let mainStoryboardIpad : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let initialViewControlleripad : UIViewController = mainStoryboardIpad.instantiateViewController(withIdentifier: "goToLogin") as! LoginViewController
    self.window = UIWindow(frame: UIScreen.main.bounds)
    self.window?.rootViewController = initialViewControlleripad
    self.window?.makeKeyAndVisible()
}
return true

}

当我在 iPhone 6 上运行该应用程序时，我得到了。

[Firebase/Core][I-COR000003] 默认 Firebase 应用尚未配置。将FirebaseApp.configure() 添加到您的应用程序初始化中。这可以在 App Delegate 的应用程序中完成（_:didFinishLaunchingWithOptions:)(or the@main` 结构在 SwiftUI 中的初始化程序）。

Answer 1

将FirebaseApp.configure() 移到顶部，因为在调用任何 Firebase 方法之前应该首先调用它。