ios - 如何在数据快照中提取节点的子节点

Question

我的 firebase 设置是这样的:

Parent_node:{
    Type:{
        1476663471800:{ //This is a timestamp = Int64(date.timeIntervalSince1970 * 1000.0) 
            uid: USERS_UID;
        }
    }
}

我将如何访问用户 uid？我试过下面的代码，但它没有提取 UID

self.databaseRef.child("Parent_node/\(Type)").queryLimitedToLast(5).observeEventType(.Value, withBlock: { (snapshot) in

   print(snapshot)
   if let userDict = snapshot.value as? [String:AnyObject]{
        for each in userDict{
            let uidExtraced = each
            print(uidExtraced)
            //("1476663471700", [uid: USERS_UID])

Answer 1

首先使用 snapshot.value?.allValues 获取值然后解析它...

  if snapshot.exists() {
     for value in (snapshot.value?.allValues)!{
          print(value) // you get [uid: USERS_UID] here

          // ... parse it to get USERS_UID
          print("user_id -- \(value["uid"])")
      }
  }

With this method, order of child might be different. For ordered nodes, you can use snapshot.child