fetching firestore data in applicationDidFinishLaunchingWithOptions - swift

Question

I'm using firebase firestore and authentication .
My app is basically managing orders, when a user sends a new order to firestore it gets a openOrder default Boolean var, I have another app that manage this order and once my other app reads the order the boolean var changes value.
All of that works.
My issue is when a user closes completly the app and then reopens it I need to check if the openOrder is true or not and according to that set my rootViewController .
I'm using a completion handler to fetch the openOrder var and check if it is true or not but applicationDidFinishLaunchingWithOptions returns true before I set my local vars according to the firestore functions.
my code is :
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

You can show a loading activity above the rootViewController until get that value , then
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
}
Edit : set storyboardID here