在swift中进行firebase的聊天对话
在swift中进行firebase的聊天对话
提问于 2018-06-04 00:21:58
我使用了这个模型：
import Foundation
class Chat {
var message: String?
var senderID: String
var receiverID: String
var timestamp : String
init(messageTextString: String?, senderIDNumber: String, receiverIDNumber: String, timeStampString: String){
message = messageTextString
senderID = senderIDNumber
receiverID = receiverIDNumber
timestamp = timeStampString
}
}而对于ChatViewController：
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int{
return chats.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellIdentifier, for: indexPath) as! ChatCollectionViewCell
let senderIDNumber = Auth.auth().currentUser?.uid
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.messageSend.frame = CGRect(x:view.frame.width - estimatedFrame.width,y:0,width:estimatedFrame.width + 16, height:estimatedFrame.height + 20)
cell.textBubbleView.frame = CGRect(x:view.frame.width - estimatedFrame.width,y:0,width:estimatedFrame.width + 16 + 8, height:estimatedFrame.height + 20)
}
return cell
}
@objc 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)
}
func loadPosts() {
let ref = Database.database().reference()
let senderIDNumber = Auth.auth().currentUser?.uid
ref.child("chats").queryOrdered(byChild: "senderID").queryEqual(toValue: senderIDNumber).observe(.childAdded) { (snapshot: DataSnapshot) in
if let dict = snapshot.value as? [String: Any] {
let messageText = dict["message"] as! String
let senderIDNumber = dict["senderID"] as! String
let receiverIDNumber = dict["receiverID"] as? String
let timestamp = dict["timestamp"] as? String
let chat = Chat(messageTextString: messageText, senderIDNumber: senderIDNumber, receiverIDNumber: receiverIDNumber!, timeStampString: timestamp!)
//append(post) to array
self.chats.append(chat)
print(self.chats)
self.collectionView.reloadData()
}
}
}
func loadPostsReceivedMessage() {
let ref = Database.database().reference()
ref.child("chats").queryOrdered(byChild: "receiverID").queryEqual(toValue: receiverIDNumber).observe(.childAdded) { (snapshot: DataSnapshot) in
if let dict = snapshot.value as? [String: Any] {
let messageText = dict["message"] as! String
let senderIDNumber = dict["senderID"] as! String
let receiverIDNumber = dict["receiverID"] as? String
let timestamp = dict["timestamp"] as? String
let chat = Chat(messageTextString: messageText, senderIDNumber: senderIDNumber, receiverIDNumber: receiverIDNumber!, timeStampString: timestamp!)
self.chats.append(chat)
print(self.chats)
self.collectionView.reloadData()
}
}
}
}我希望能够区分传出和传入的消息，但无法做到这一点。我确实想过创建一个Incoming布尔值来区分传出和传入的消息；但不知道如何实现。我需要帮助和建议，谢谢。
回答 2
Stack Overflow用户
发布于 2018-06-04 01:52:02
Firebase无法执行查询！(特别是多排序)..Need迁移到firestorm( firebase存储的新测试版)或使用angular。
Stack Overflow用户
发布于 2018-06-04 12:31:01
要区分已发送的消息和已接收的消息，只需向Chat对象添加一个属性即可，因此您可能具有以下内容：
class Chat {
var message: String
var senderID: String
var receiverID: String
var timestamp : String
var isFromCurrentUser: Bool = false // You'll only need to change this property if the message is from the current sender.
init(messageTextString: String?, senderIDNumber: String, receiverIDNumber: String, timeStampString: String){
self.message = messageTextString
self.senderID = senderIDNumber
self.receiverID = receiverIDNumber
self.timestamp = timeStampString
}
}在修改对象之后，您需要查看一下获取数据的方式。我建议将loadPosts()重命名为listenForChatItemAdded()，并将函数更改为以下内容：
注意:使用查询并不是必需的。当您只需要一组特定的数据时，查询特别有用；在这里，您最好抓取数据，并在对象初始化后对其进行排序。
func loadPosts() {
let ref = Database.database().reference()
let senderIDNumber = Auth.auth().currentUser?.uid
ref.child("chats").observe(.childAdded) { (snapshot: DataSnapshot) in
if let dict = snapshot.value as? [String: Any] {
let messageText = dict["message"] as! String
let senderIDNumber = dict["senderID"] as! String
let receiverIDNumber = dict["receiverID"] as? String
let timestamp = dict["timestamp"] as? String
let chat = Chat(messageTextString: messageText, senderIDNumber: senderIDNumber, receiverIDNumber: receiverIDNumber!, timeStampString: timestamp!)
let currentUserUID = Auth().auth().currentUser!.uid
if senderID == currentUserUID {
chat.isFromCurrentUser = true
}
//append(post) to array
self.chats.append(chat)
//after adding the new chat tot the array, sort the array
let sorted = filtered.sorted { (chat1, chat2) -> Bool in
return chat1.timestamp > chat2.timestamp
}
// update the current array with the sorted array
self.chats = sorted
// reload the collectionView
self.collectionView.reloadData()
}
}
}最后，只需检查我们创建的属性，以确定您应该如何可视化地设置单元格。我将创建UICollectionViewCell的两个子类。一个用于发送者，另一个用于接收者。如果聊天是由当前用户发送的，则使用sender子类创建一个单元格；如果聊天是由其他任何人发送的，则使用receiver子类。
希望这能帮上忙，干杯！
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50668482
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