ios - 如何从 Firebase 加载标签中的文本？

Question

我需要加载 child “Nick”的文本每次我的程序更改 void 上的标签文本:(

这是我的代码:

  ref = Database.database().reference()
refHandle = ref.observe(DataEventType.value, with: { (snapshot) in
    let dataDict = snapshot.value as! [String: AnyObject]
    print(dataDict)
})

let userID: String = (Auth.auth().currentUser?.uid)!
ref.child("Users").child(userID).child("Nick").observeSingleEvent(of: .value, with: { 
    snapshot in 
    print(snapshot)
    let m = snapshot.value as? String
    self.label.text = m
})

And this is how my Firebase looks like

Answer 1

您必须从快照值中获取值“Nick”。所以你的代码将如下所示:

let userID: String = (Auth.auth().currentUser?.uid)!
ref.child("Users").child(userID).child("Nick").observeSingleEvent(of: .value, with: { 
    snapshot in 

    guard let value = snapshot.value as? [String: Any] else { return }
    guard let name = value["Nick"] as? String else { return }

    let m = name
    self.label.text = m
})