Question

我正在尝试使用时间戳功能来处理我的应用，但事实并非如此。我正在使用JSQMessagesViewController构建聊天应用。对于用户发送的每条消息，我希望它显示在我的数据库中。

到目前为止，这是我的代码：

//ADD A NEW MESSAGE

let timeStamp = NSNumber(value: Int(NSDate().timeIntervalSince1970))

    private func addMessage(withId id: String, name: String, text: String, time: NSNumber) {
        if let message = JSQMessage(senderId: id, displayName: name, text: text) {
            messages.append(message)
        }
    }

    override func didPressSend(_ button: UIButton!, withMessageText text: String!, senderId: String!, senderDisplayName: String!, date: Date!) {

        let itemRef = rootRef.child("messages").child("\(self.convoId!)").childByAutoId() // 1
        let messageItem = [ // 2
            "senderId": senderId!,
            "ReceiverId": senderDisplayName!,
            "text": text!,
            "timestamp": timeStamp,
            ] as [String : Any]

        itemRef.setValue(messageItem) // 3

        JSQSystemSoundPlayer.jsq_playMessageSentSound() // 4

        finishSendingMessage() // 5
        isTyping = false
    }

 private func observeMessages() {
    // 1.
    let messageQuery = rootRef.child("messages/\(self.convoId!)").queryLimited(toLast: 25)

    // 2. We can use the observe method to listen for new
    // messages being written to the Firebase DB
    newMessageRefHandle = messageQuery.observe(.childAdded, with: { (snapshot) -> Void in

    // 3.
    let messageData = snapshot.value as! Dictionary<String, String>

    if let id = messageData["senderId"] as String!, let name = messageData["ReceiverId"] as String!, let text = messageData["text"] as String!, let time = messageData["timeStamp"] as Any!, text.characters.count > 0 {

    // 4.
    self.addMessage(withId: id, name: name, text: text, time: time as! NSNumber)

    // 5
    self.finishReceivingMessage()
  }

以下是我的数据库的屏幕截图：

Answer 1

更改此行：

let messageData = snapshot.value as! [String: AnyObject]

Answer 2

直接发送时间戳，无需将其转换为nsnumber

override func didPressSend(_ button: UIButton!, withMessageText text: String!, senderId: String!, senderDisplayName: String!, date: Date!) {

            let itemRef = rootRef.child("messages").child("\(self.convoId!)").childByAutoId() // 1
            let messageItem = [ // 2
                "senderId": senderId!,
                "ReceiverId": senderDisplayName!,
                "text": text!,
                "timestamp": NSDate().timeIntervalSince1970,
                ] as [String : Any]

            itemRef.setValue(messageItem) // 3

            JSQSystemSoundPlayer.jsq_playMessageSentSound() // 4

            finishSendingMessage() // 5
            isTyping = false
        }

向Firebase数据库添加值

2 个答案: