Duplicate Cell loading in UItableview Swift 4 - ios

Question

I have been stuck on this bug for the past 5 hours I Really need some help. I am making a chat application that has private messaging. When a user sends a text everything works great. But when a use trys to reply to a message another user sent , things get weird.
the user duplicates, along with failing to update time and the most recent text! whats going on! here is the code
Message controller: loads the message users from which firebase provides I know this could have potentially been an uploading to firebase issue, where their are two children but my firebase looks fine, NO duplicates on the back end. The error ive narrowed it down to being in this class when loading these custom cells into a table view! how do i force it to stop duplicating and rather load the correct one? Thank you so much!
import UIKit
import Firebase
class MessagesViewController: UIViewController , UITableViewDelegate
, UITableViewDataSource{
#IBOutlet weak var messagesLabelOutlet: UILabel!
#IBOutlet weak var messagesTableView: UITableView!
var newUser : User?
var messageArr = [Message]()
var messageDict = [String: Message]()
override func viewDidLoad() {
super.viewDidLoad()
messagesTableView.dataSource = self
messagesTableView.delegate = self;
self.messagesTableView.register(UserCell.self, forCellReuseIdentifier: "cellId")
checkIfUserIsLoggedIn()
messageArr.removeAll()
messageDict.removeAll()
messagesTableView.reloadData()
observeUserMessages()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return messageArr.count;
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 72;
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.newUser = User()
if let chatPartnerId = messageArr[indexPath.row].chatPartnerId(){
self.newUser?.toId! = chatPartnerId;
let chatPartnerDataRef = Database.database().reference().child("users").child(chatPartnerId)
chatPartnerDataRef.observeSingleEvent(of: .value) { (snapshot) in
guard let dict = snapshot.value as? [String : AnyObject] else{
return
}
self.newUser?.userName = dict["username"] as? String
self.newUser?.picURL = dict["pic"] as? String
self.newUser?.score = dict["score"] as? String
self.performSegue(withIdentifier:
"goToChatLogControllerPlzFromMessages", sender: self)
}
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cellId", for: indexPath) as! UserCell
let message = messageArr[indexPath.row]
let totalSection = tableView.numberOfSections
cell.textLabel?.font = UIFont(name: "Avenir Book" , size: 19);
cell.detailTextLabel?.font = UIFont(name: "Avenir Light" , size: 14);
cell.message = message;
return cell;
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// do not remove
if segue.identifier == "goToChatLogControllerPlzFromMessages"{
print("going to chat log")
let recieveVC = segue.destination as! ChatLogController
if let textUser = newUser{
recieveVC.user = textUser;
}
}
}
func checkIfUserIsLoggedIn()
{
if Auth.auth().currentUser?.uid == nil{
print("uid is nil")
performSegue(withIdentifier: "noUserFoundGoingBackToLogin", sender: self);
}
else{
let uid = Auth.auth().currentUser?.uid
Database.database().reference().child("users").child(uid!).observeSingleEvent(of: .value, with: { (snapshot) in
})
}
}
func observeUserMessages(){
print("NEW USER \(newUser?.userName)")
print("MESSAGE ARR \(messageArr)")
print("MESSAGE DICT\(messageDict.values)")
guard let uid = Auth.auth().currentUser?.uid else{
checkIfUserIsLoggedIn()
return;
}
let ref = Database.database().reference().child("user-messages").child(uid)
ref.observe(.childAdded) { (snapshot) in
let messageId = snapshot.key
let messagesRef = Database.database().reference().child("messages").child(messageId)
messagesRef.observeSingleEvent(of: .value, with: { (snapshot) in
if let dict = snapshot.value as? [String : AnyObject]
{
let message = Message()
message.fromId = dict["fromid"] as? String;
message.text = dict["text"] as? String;
message.timestamp = dict["timestamp"] as? String;
message.toId = dict["toid"] as? String;
self.messageArr.append(message)
if let toID = message.toId{
self.messageDict[toID] = message;
self.messageArr = Array(self.messageDict.values)
self.messageArr.sort(by: { (message1, message2) -> Bool in
let time1 = Int(truncating: (message1.timestamp?.numberValue)!)
let time2 = Int(truncating: (message2.timestamp?.numberValue)!)
return time1 > time2
})
}
DispatchQueue.main.async {
print(message.text!)
self.messagesTableView.reloadData()
}
}
})
}