如何使用JSQMessages显示用户的Firebase帐户名称？

Question

我正在尝试从firebase数据库中检索个人用户信息，例如名字和姓氏，并在用户向其他用户发送消息时将其显示在消息气泡上方。

下面是我的代码。我能够发送发送消息，它只是显示Firebase用户名。有什么建议吗？

谢谢！

class ChatViewController: JSQMessagesViewController {

var messages = [JSQMessage] ()

lazy var outgoingBubble: JSQMessagesBubbleImage = {
    return JSQMessagesBubbleImageFactory()!.incomingMessagesBubbleImage(with: UIColor.jsq_messageBubbleLightGray())
} ()

lazy var incomingBubble: JSQMessagesBubbleImage = {
    return JSQMessagesBubbleImageFactory()!.incomingMessagesBubbleImage(with: UIColor.jsq_messageBubbleBlue())
} ()

override func viewDidLoad() {
    super.viewDidLoad()

    self.senderDisplayName = "Wolverine"
    self.senderId = Auth.auth().currentUser?.uid


    // The first line hides the attachment button on the left of the chat text input field. The other two lines of code set the avatar size to zero, again, hiding it.

    inputToolbar.contentView.leftBarButtonItem = nil
    collectionView.collectionViewLayout.incomingAvatarViewSize = CGSize.zero
    collectionView.collectionViewLayout.outgoingAvatarViewSize = CGSize.zero

    // Do any additional setup after loading the view.
    let query = Constants.refs.databaseChats.queryLimited(toLast: 10)

    _ = query.observe(.childAdded, with: { [weak self] snapshot in

        if  let data        = snapshot.value as? [String: String],
            let id          = data["sender_id"],
            let name        = data["name"],
            let text        = data["text"],
            !text.isEmpty
        {
            if let message = JSQMessage(senderId: id, displayName: name, text: text)
            {
                self?.messages.append(message)

                self?.finishReceivingMessage()
            }
        }
    })
}
override func collectionView(_ collectionView: JSQMessagesCollectionView!, messageDataForItemAt indexPath: IndexPath!) -> JSQMessageData! {
    return messages[indexPath.item]

}

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return messages.count
}
override func collectionView(_ collectionView: JSQMessagesCollectionView!, messageBubbleImageDataForItemAt indexPath: IndexPath!) -> JSQMessageBubbleImageDataSource!
{
    return messages[indexPath.item].senderId == senderId ? outgoingBubble : incomingBubble
}

// This function simply returns nil when JSQMVC wants avatar image data, effectively hiding the avatars. hides the avatars for message bubbles. JSQMVC can show them, but its not needed.

override func collectionView(_ collectionView: JSQMessagesCollectionView!, avatarImageDataForItemAt indexPath: IndexPath!) -> JSQMessageAvatarImageDataSource!
{
    return nil
}
override func collectionView(_ collectionView: JSQMessagesCollectionView!, attributedTextForMessageBubbleTopLabelAt indexPath: IndexPath!) -> NSAttributedString!
{
    return messages[indexPath.item].senderId == senderId ? nil : NSAttributedString(string: messages[indexPath.item].senderDisplayName)
}

override func collectionView(_ collectionView: JSQMessagesCollectionView!, layout collectionViewLayout: JSQMessagesCollectionViewFlowLayout!, heightForMessageBubbleTopLabelAt indexPath: IndexPath!) -> CGFloat
{
    return messages[indexPath.item].senderId == senderId ? 0 : 15
}
override func didPressSend(_ button: UIButton!, withMessageText text: String!, senderId: String!, senderDisplayName: String!, date: Date!)
{
    let ref = Constants.refs.databaseChats.childByAutoId()

    let message = ["sender_id": senderId, "name": senderDisplayName, "text": text]

    ref.setValue(message)

    finishSendingMessage()
  }
 }