swift - 如何在标签中从 Firebase 加载数据？

Question

问题在于标签不会使用“Nick”子项中 Firebase 中的文本更改其文本。

这就是我的代码的样子:

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
})

这就是我的 Firebase 数据的样子:

Answer 1

试试这个:

        ref = Database.database().reference().child("Users").child(userID)
        ref.observeSingleEvent(of: .value, with: { snapshot in
            if let snap = snapshot.value as? [String : AnyObject] {
               if let result = snap["Nick"] as? String {
                  self.label.text = result
               }else
                  print("nick not exist")
               }
            }else{
               print("maybe USER UID not exist in database ")
            }
         })