Firebase：如何從子節點中提取子鍵值swift

Question

我如何提取孩子的ID值（即followerID1，followerID2 ...）？該火力點的結構如下：

Followers:{ 
    USER_ID:{ 
     followerID1 = false; 
     followerID2 = true; 
     followerID3 = true; 
    } 
} 

Im做在Xcode以下，但它顯示我下USER_ID整個節點：

self.databaseRef.child("Followers").child(self.USER_ID).Value, withBlock: { (snapshot:FIRDataSnapshot) in 
      self.userFollowDump = snapshot 
}) 

謝謝！我是新來的火力點:)

Answer 1

試試這個： -

• 斯威夫特3

  FIRDatabase.database().reference().child("Followers").child(FIRAuth.auth()!.currentUser!.uid).observeSingleEvent(of: .value, with: { (snapshot) in 
       if let userDict = snapshot.value as? [String:AnyObject]{ 
        for each in userDict{ 
         let follwerID = each.0 as! String // Every follwers ID. 
        } 
       } 
      }) 
  

  如果你正在尋找followerId它的價值true。

  FIRDatabase.database().reference().child("Followers").child(FIRAuth.auth()!.currentUser!.uid).queryOrderedByValue().queryEqual(toValue: true).observeSingleEvent(of: .value, with: {(snap) in 
       if let snapDict = snap.value as? [String:AnyObject]{ 
        for each in snapDict{ 
  
         print(each.key) 
        } 
       } 
      }) 
  

• 斯威夫特2

  FIRDatabase.database().reference().child("Followers").child(FIRAuth.auth()!.currentUser!.uid).observeSingleEventOfType(.Value, withBlock: { (snapshot) in 
  if let userDict = snapshot.value as? [String:AnyObject]{ 
       for each in userDict{ 
       let follwerID = each.0 as! String // Every follwers ID. 
       } 
      } 
      }) 
  

  但是，如果你正在尋找followerId它的價值是true

  FIRDatabase.database().reference().child("Followers").child(FIRAuth.auth()!.currentUser!.uid).queryOrderedByValue().queryEqualToValue(true).observeSingleEventOfType(.Value, withBlock: {(snap) in 
      if let snapDict = snap.value as? [String:AnyObject]{ 
       for each in snapDict{ 
  
        print(each.key) 
       } 
      } 
  })