按时间顺序排列聊天

Question

我想按时间顺序显示聊天。我正在使用firebase和jsqmessageViewController。我认为问题在观测分配功能中。但是，我没有找到按时间顺序显示聊天的正确方法。他们目前正在完全随机显示。

 override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    observeConversations()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return conversations.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "chatCell", for: indexPath) as! ChatTableViewCell
    cell.setConversation(conversations[indexPath.row])
    return cell
}
func observeConversations() {
    guard let user = Auth.auth().currentUser else { return }
    let ref = Database.database().reference().child("conversations/users/(user.uid)")
    ref.observe(.value, with: { snapshot in
        var _conversations = [Conversation]()
        for child in snapshot.children {
            if let childSnap = child as? DataSnapshot,
                let dict = childSnap.value as? [String:Any],
                let key = dict["key"] as? String,
                let sender = dict["sender"] as? String,
                let recipient = dict["recipient"] as? String,
                let text = dict["text"] as? String,
                let timestamp = dict["timestamp"] as? Double,
                let muted = dict["muted"] as? Bool, !muted,
                let seen = dict["seen"] as? Bool {
                let date = Date(timeIntervalSince1970: timestamp/1000)
                let conversation = Conversation(key: key, sender: sender, recipient: recipient, date: date, recentMessage: text, seen: seen)
                _conversations.append(conversation)
            }
        }
        self.conversations = _conversations
        self.tableView.reloadData()
    })
}

Answer 1

如果要检索时间戳订购的项目：

let ref = Database.database().reference().child("conversations/users/(user.uid)")
ref.orderQuery(byChild: "timestamp").observe(.value, with: { snapshot in