客户端按时间戳过滤订单文本消息

Question

目前它显示在左侧发送的短信，然后在右侧显示收到的短信。但是，我希望接收和发送的短信一次按时间戳排序（目前它首先按发送排序时间戳，然后显示发送的消息，然后再按时间戳对接收的消息进行排序，然后显示接收的消息。）

override func viewDidLoad() {
    super.viewDidLoad()
    loadPosts()
    loadPostsReceivedMessage()
    }
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell{
 let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellIdentifier, for: indexPath) as! ChatCollectionViewCell    
     let senderIDNumber = Auth.auth().currentUser?.uid

//Setup the messageReceived and messageSent
        if chats[indexPath.row].senderID == senderIDNumber {
        if let chatsText = chats[indexPath.row].message{
            let size = CGSize(width: 250, height: 1000)
            let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
            let estimatedFrame = NSString(string: chatsText).boundingRect(with: size, options: options, attributes: [NSAttributedStringKey.font : UIFont.systemFont(ofSize: 18)], context: nil)
            cell.messageSend.frame = CGRect(x:8,y:0,width:estimatedFrame.width + 16, height:estimatedFrame.height + 20)
            cell.textBubbleView.frame = CGRect(x:0,y:0,width:estimatedFrame.width + 16 + 8, height:estimatedFrame.height + 20)
         //showOutgoingMessage(text: chats[indexPath.row].message)
    }
            cell.messageSend.text = chats[indexPath.row].message
        }
    else {
            cell.messageReceived.text = chats[indexPath.row].message
            let chatsText = chats[indexPath.row].message
            let size = CGSize(width: 250, height: 1000)
            let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
            let estimatedFrame = NSString(string: chatsText!).boundingRect(with: size, options: options, attributes: [NSAttributedStringKey.font : UIFont.systemFont(ofSize: 18)], context: nil)
            cell.messageReceived.frame = CGRect(x:view.frame.width - estimatedFrame.width - 30,y:0,width:estimatedFrame.width + 16, height:estimatedFrame.height + 20)
            cell.textBubbleView.frame = CGRect(x:view.frame.width - estimatedFrame.width - 30,y:0,width:estimatedFrame.width + 16 + 4, height:estimatedFrame.height + 20)
    }
    return cell
}

func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
if let chatsText = chats[indexPath.row].message {
    let size = CGSize(width: 250, height: 1000)
        let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
        let estimatedFrame = NSString(string: chatsText).boundingRect(with: size, options: options, attributes: [NSAttributedStringKey.font : UIFont.systemFont(ofSize: 18)], context: nil)
        return CGSize(width: view.frame.width, height: estimatedFrame.height + 20)
    }

    return CGSize(width: view.frame.width, height: 200)
}

//Get Message sent
  func loadPosts() {
    let senderIDNumber = Auth.auth().currentUser?.uid
    let chatsRef = db.collection("chats").order(by: "timestamp", descending: false)
    chatsRef.whereField("senderID", isEqualTo: senderIDNumber!).whereField("receiverID", isEqualTo: receiverIDNumber)
        .addSnapshotListener { querySnapshot, error in
            guard let documents = querySnapshot?.documents else {
                print("Error fetching documents: \(error!)")
                return
            }
            for document in documents {
                let messageText = document.data()["message"] as? String
                let senderIDNumber = document.data()["senderID"] as? String
                let receiverIDNumber = document.data()["receiverID"] as? String
                let timestamp = document.data()["timestamp"] as? String
                guard let sender = document.data()["sender"] as? String else {return}
               // let conversationsCounter = document.data()["conversationsCounter"] as? Int
                guard let profileUrl = document.data()["profileUrl"] as? String else { return}
                let chat = Chat(messageTextString: messageText!, senderIDNumber: senderIDNumber!, receiverIDNumber: receiverIDNumber!, timeStampString: timestamp!, profileImageUrl: profileUrl, senderString: sender)
self.chats.append(chat)
print(self.chats)
self.collectionView.reloadData()
}
}
}


//Get message received
func loadPostsReceivedMessage() {
   /* let uid = Auth.auth().currentUser?.uid
    let ref = Database.database().reference()
    ref.child("users").child(uid!).observeSingleEvent(of: .value, with: { (snapshot) in
        if let dic = snapshot.value as? [String: AnyObject]{
            let currentUser = dic["username"] as? String
            let senderIDNumber = Auth.auth().currentUser?.uid
        } */
            let chatsRef = db.collection("chats").order(by: "timestamp", descending: false)
            print("thecurrentreceiver"+senderString)
            print("thecurrentsender"+receiverIDNumber)
    chatsRef.whereField("receiverID", isEqualTo: senderString).whereField("sender", isEqualTo: receiverIDNumber)
                .addSnapshotListener { querySnapshot, error in
                    guard let documents = querySnapshot?.documents else {
                        print("Error fetching documents: \(error!)")
                        return
                    }
                    for document in documents {
                        let messageText = document.data()["message"] as? String
                        let senderIDNumber = document.data()["senderID"] as? String
                        let receiverIDNumber = document.data()["receiverID"] as? String
                        let timestamp = document.data()["timestamp"] as? String
                        // let conversationsCounter = document.data()["conversationsCounter"] as? Int
                        guard let profileUrl = document.data()["profileUrl"] as? String else { return}
                        guard let sender = document.data()["sender"] as? String else {return}
                        let chat = Chat(messageTextString: messageText!, senderIDNumber: senderIDNumber!, receiverIDNumber: receiverIDNumber!, timeStampString: timestamp!,profileImageUrl: profileUrl, senderString: sender)
                        print("whatisthemessage"+messageText!)
                        self.chats.append(chat)
                        print(self.chats)
                        self.collectionView.reloadData()
                    }
            }
}

Answer 1

我想你已经为这个麻烦做好了准备。你为什么不直接使用这个结构：

  -chats
   --chatID
      ---senderID
      ---receiverID

这样，每一条进来的消息都是一个以发件人 ID 命名的文档。然后当你想loadPosts()快照时，它是按时间顺序排列的，你唯一要做的就是根据发件人的身份将它们放在右边或左边。