Swift Tableview cell re-appear after deletion - ios

Question

I am working on a twitter clone and I connected my app to firebase to read and write the posts. However, when I delete a cell the animation starts and the deletion actually happens from my posts array. The problem is when I try to delete another post the post I already deleted re-appears for some reason.
Here are some screenshots of what is happening:
First I delete a post and everything is normal.
deleting a post
Then the post is deleted
deleted post
now I try to delete another post
deleting another post
Then the older post re-appears in the place of the last post deleted.
deleted post reappears
This continues until I get an index out of bounds exception when I attempt to delete all the cells.
As seen from the screenshots, I delete the cells from a delete button which is why I need a callback from the cell.
Here is my code for the cell and for the "Home Screen"
class PostTableViewCell: UITableViewCell, UITextViewDelegate{
var didDelete : ((UITableViewCell) -> Void)?
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
func set(post: Post){
username.text = post.username
postText.text = post.text
timestamp.text = post.createdAt.calenderTimeSinceNow()
postId = post.id
setPopupMenu(post: post)
}
func setPopupMenu(post: Post){
let options = { (action: UIAction) in
print(action.title)
if(action.title == "Delete"){
// delete post
self.didDelete!(self)
}
}
menuButton.showsMenuAsPrimaryAction = true
}
}
and this is the Home Screen code :
class HomeViewController: UIViewController, UITableViewDelegate, UITableViewDataSource{
let cellNib = UINib(nibName: "PostTableViewCell", bundle: nil)
var posts = [Post]()
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(cellNib, forCellReuseIdentifier: "postCell")
tableView.delegate = self
tableView.dataSource = self
readPosts()
// Do any additional setup after loading the view.
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
tableView.reloadRows(at: [indexPath], with: .fade)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "postCell", for: indexPath) as! PostTableViewCell
cell.set(post: posts[indexPath.row])
cell.didDelete = { aCell in
self.progressView.isHidden = false
let currentIndexPath = tableView.indexPath(for: aCell)!
let db = Firestore.firestore()
db.collection("Posts").document(Auth.auth().currentUser!.uid).collection("Posts").document(cell.postId).delete() { err in
self.progressView.isHidden = false
if let err = err {
print("Error removing document: \(err)")
} else {
self.posts.remove(at: indexPath.row)
tableView.deleteRows(at: [currentIndexPath], with: .automatic)
self.progressView.isHidden = true
}
}
}
return cell
}
func readPosts(){
let db = Firestore.firestore()
db.collection("Posts").addSnapshotListener { documentSnapshot, error in
guard let document = documentSnapshot else {
print("Error fetching document: \(error!)")
return
}
var tempPosts = [Post]()
for doc in documentSnapshot!.documents{
db.collection("Posts").document(doc.documentID).collection("Posts").order(by: "timestamp").addSnapshotListener { documentSnapshot, error in
for docu in documentSnapshot!.documents {
let daate = docu.data()["timestamp"] as! Timestamp
let mydbl = daate.dateValue().timeIntervalSince1970 * 1000
let post = Post(id: docu.documentID, username: "#\(docu.data()["username"]!)", userId: doc.documentID , text: docu.data()["text"] as! String, timestamp: mydbl , numLikes: 0, numReposts: 0)
let isDuplicate = tempPosts.contains(where: { $0.id == post.id })
if(!isDuplicate){
tempPosts.insert(post, at: 0)
}
}
self.posts.removeAll()
self.posts = tempPosts
self.tableView.reloadData()
}
}
self.progressView.isHidden = true
}
}
}
Note that when I comment out the firebase document deletion part everything works fine and the deleted document is not re produced