Swift只能从Firebase中看到一个值（检索数据）

Question

我只能在我的应用程序上看到用户名，而不是年龄，但是我可以在编译器中看到两个值，但不确定是什么问题。

func fetchDataa(){
    // var ref: DatabaseReference!

    //  ref = Database.database().reference()
    guard  let currentUid = Auth.auth().currentUser?.uid else {return}
    Database.database().reference().child("users").child(currentUid).observeSingleEvent(of: .value, with: { (snapshot) in
        guard let dictionary = snapshot.value as? Dictionary<String , AnyObject> else {return}
        let uid = snapshot.key
        let user = User(uid:uid , dictionary: dictionary)

        print(Thread.current)
        print(Thread.main)

        self.userAgeLabel.text = user.userage
        self.user = user
               self.userAgeLabel.text = user.userage
               self.user = user

        print(snapshot.value)
        // Get user value
        //  let value = snapshot.value as? NSDictionary

        print(dictionary)


        // ...
    }) { (error) in
        print(error.localizedDescription)

    }

//这就是我将信息存储为字典的方式   //已存储用户信息

  let userID = Auth.auth().currentUser?.uid
        let userData = ["userName": userName,
            "userAge ": userAge] as [String? : Any]


        let ref = Database.database().reference()
        ref.child("users/\(userID ?? "")").setValue(userData)

      // ref.child("users").setValue(values)

}

//用户初始化程序类

班级用户{

var username:String!
var userage:String!
var uid:String!

init（uid：String，dictionary：Dictionary）{

self.uid = uid

if let username = dictionary [ "userName" ] as? String{

    self.username = username
}

if let userage = dictionary [ "userAge" ] as? String{
    self.userage = userage
}
}
}
}

Firebase结构：

Answer 1

你可以试试吗？

        Database.database().reference().child("users").child(currentUid).observeEvent(of: .value, with: { (snapshot) in
 if let dictionary = snapshot.value as? [String: Anyobject] {
 let userAgeDictionary = dictionary["age"] as? String
print(userAgeDictionary)

这会打印出年龄吗？

Answer 2

您已经在"属性周围添加了额外的userAge。因此，关键是"userAge" 包括双引号。

要从字典中获取该值：

if let userage = dictionary [ "\"userAge\"" ] as? String{
    self.userage = userage
}

但是，今后您可能需要解决实际数据中的问题：在Firebase控制台中输入密钥时，由于密钥始终是字符串，因此不需要在其周围输入引号。