在 applicationDidFinishLaunchingWithOptions 中获取 firestore 数据

Question

我正在使用 firebase firestore 和身份验证。

我的应用基本上是管理订单，当用户向 firestore 发送新订单时，它会得到一个 openOrder 默认布尔变量，我有另一个应用管理这个订单，一旦我的另一个应用读取订单，布尔变量就会改变值.

所有这些都有效。

我的问题是当用户完全关闭应用程序然后重新打开它时，我需要检查 openOrder 是否为真，并根据该设置设置我的 rootViewController 。我正在使用完成处理程序来获取 openOrder var 并检查它是否为真但 applicationDidFinishLaunchingWithOptions returns 在我根据 firestore 函数设置本地变量之前为真。

我的代码是：

   func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    FirebaseApp.configure()

       let reValue = loadPriviousDishesIfUserQuitsAppBeforeClosingTab(completion: { success in
            guard success! else { return }
            //here I have all the values I need and need to return only here 
        })

    return true
}



   func loadPriviousDishesIfUserQuitsAppBeforeClosingTab(completion: @escaping (Bool?) ->()) {
    db = Firestore.firestore()
    let myUserID = Auth.auth().currentUser?.uid
    db.collection("users").whereField("user", isEqualTo: myUserID!).whereField("openOrder", isEqualTo: true).getDocuments { (querySnapshot, error) in
        if let err = error {
            print(err.localizedDescription)
            completion(nil)
        }
        else {

            for doc in  (querySnapshot?.documents)! {
                guard let  restID = doc.data()[ResttId"]
                    else {return}
                myRestaurant.restID = restID as? String
                self.setMyRestMenu(completion: { success in
                    guard success else { return }


                    //here I set all my values using fetching all the data from firestore,

                })
            }
            completion(true)
        }
    }

}

Answer 1

您可以在 rootViewController 上方显示加载 activity，直到获得该值，然后

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {


   let reValue = loadPriviousDishesIfUserQuitsAppBeforeClosingTab(completion: { success in
        guard success! else { return }
        //here I have all the values I need and need to return only here 

         let stor = UIStoryboard.init(name: "Main", bundle: nil)

        let welcomeView = stor.instantiateViewController(withIdentifier: "orderView")

        let nav = UINavigationController(rootViewController: welcomeView )

        nav.navigationBar.isHidden = true

       self.window?.rootViewController = nav
    })

    return true
}

编辑：在此处设置故事板 ID

在 applicationDidFinishLaunchingWithOptions 中获取 firestore 数据

fetching firestore data in applicationDidFinishLaunchingWithOptions

completionhandler

swift

google-cloud-firestore