问在Swift中将值从struct更新为Firestore

EN

struct Usersdata {
let uid:String?
let facebook:String?
let google : String?
let name : String?
let age : Int?
let birthday : String?
let smokeage  : Int?
let smokeaddiction : Int?
let smokebrand  : String?
let gold : Int?
let score : Int?
let fish : Int?
let shit : Int?
let userimage  : String?
init(aDoc: DocumentSnapshot) {
    self.uid = aDoc.get("uid") as? String ?? ""
    self.facebook = aDoc.get("facebook") as? String ?? ""
    self.google = aDoc.get("google") as? String ?? ""
    self.name = aDoc.get("name") as? String ?? ""
    self.age = aDoc.get("age") as? Int ?? 0
    self.birthday = aDoc.get("birthday") as? String ?? ""
    self.smokeage = aDoc.get("smokeage") as? Int ?? 0
    self.smokeaddiction = aDoc.get("smokeaddiction") as? Int ?? 0
    self.smokebrand = aDoc.get("smokebrand") as? String ?? ""
    self.gold = aDoc.get("gold") as? Int ?? 0
    self.score = aDoc.get("score") as? Int ?? 0
    self.fish = aDoc.get("fish") as? Int ?? 0
    self.shit = aDoc.get("shit") as? Int ?? 0
    self.userimage = aDoc.get("userimage") as? String ?? ""
    }
}

func queryAUser() {
    let docRef = self.db.collection("Users").document(userID).collection("userdata").document("userdata")
    docRef.getDocument { (document, error) in
        if let document = document, document.exists {
            let aUser = Usersdata(aDoc: document)
            self.local_userdata = aUser
        } else {
            print("Document does not exist")
        }
    }
}