Reloading tableView after liking a button in cell - swift

Question

My tableView shows some user comments loaded via Firebase Database. The tableView contains also a prototype cell. First of all loadPosts() gets executed. It loads every post and also goes to the user and takes the profile picture which is up to date and at last it sorts them after time.
Now the user has the option to like a post. In the extension UITableViewDelegate I created a cell.buttonAction. Here it opens into the users account and looks if he already liked the post with a specific id. If not it adds +1. If it did already it takes one -1.
The code itself works. But I have huge performance issues. Sometime the tableView gets updated immidiately. Sometimes I have to manually refresh it. As you can see right now I use observeSingleEvent. Should I better use observe instead? But then it crashes sometimes if someone posts and I have the same tableView opened. I also don't want it to reload every time the whole tableView if someone liked a post.
I also created a Video. Maybe it helps. I really do not know how I can solve that problem.
func loadPosts() {
let placeIdFromSearch = ViewController.placeidUebertragen
ref = Database.database().reference().child("placeID/\(placeIdFromSearch)")
ref.queryOrdered(byChild: "userTime").queryLimited(toLast: 10).observeSingleEvent(of: DataEventType.value, with: {(snapshot) in
self.table.removeAll()
for video in snapshot.children.allObjects as! [DataSnapshot] {
let Object = video.value as? [String: AnyObject]
let timestampDate = NSDate(timeIntervalSince1970: Double(Object?["userTime"] as! NSNumber)/1000)
...
let time = dateFormatter.string(from: timestampDate as Date)
...
let userTimeForArranging = Object?["userTime"]
ViewComments.commentIDNew = commentId as! String
getProfilePicture()
func getProfilePicture(){
self.ref = Database.database().reference()
self.ref.child("user/\(userID!)").observe (.value, with: { (snapshot) in
let value = snapshot.value as? NSDictionary
let userImage = value?["picture"] as? String ?? ""
let userName = value?["firstname"] as? String ?? ""
let video = importComment(userName: userName as! String, userGroup: userGroup as! String, userComment: userComment as! String, userTime: userTime as! String, userLikes: userLikes as! Int, commentId: commentId as! String, placeID: placeID as! String, kommentarCount: kommentarCount as! Int, userImage: userImage as! String, userTimeForArranging: userTimeForArranging as! Int)
self.table.insert(video, at: 0)
self.table = self.table.sorted(by: { $0.userTimeForArranging! > $1.userTimeForArranging! })
self.tableView.reloadData()
})
}
}
})
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! TableViewCell
let video: importComment
video = table[indexPath.row]
cell.layoutMargins = UIEdgeInsets.zero
...
cell.userImage.image = UIImage(url: URL(string: video.userImage!))
cell.buttonAction = {
getClickedRow(arg: true, completion: { (success) -> Void in
if success {
self.loadPosts()
} else {
}
})
func getClickedRow(arg: Bool, completion: #escaping (Bool) -> ()) {
let selectedIndexPath = self.table[indexPath.row].commentId!
ViewSubComments.subCommentIdNew = selectedIndexPath
completion(arg)
}
}
return cell
}
From Prototype cell:
#IBAction func buttonTapped(_ sender: UIButton) {
buttonAction?()
let ref = Database.database().reference()
let userID = Auth.auth().currentUser!.uid
ref.child("user/\(userID)/places/\(ViewController.placeidUebertragen)/\(ViewComments.commentIDNew)").observeSingleEvent(of: .value, with: { (snapshot) in
if snapshot.exists(){
getLikeAndMinusOne ()
let database = Database.database().reference()
database.child("user/\(userID)/places/\(ViewController.placeidUebertragen)/\(ViewComments.commentIDNew)").removeValue()
}else{
getLikeAndAddOne ()
let database = Database.database().reference()
let object: [String: Any] = [
"like": "true",]
database.child("user/\(userID)/places/\(ViewController.placeidUebertragen)/\(ViewComments.commentIDNew)").setValue(object)
}
})
func getLikeAndAddOne () {
let database = Database.database().reference()
database.child("placeID/\(ViewController.placeidUebertragen)/\(ViewComments.commentIDNew)").observeSingleEvent(of: .value, with: { (snapshot) in
let userDict = snapshot.value as! [String: Any]
let userLikes = userDict["userLikes"] as! Int
var userLikesNeu = Int(userLikes)
userLikesNeu = Int(userLikes) + 1
database.child("placeID/\(ViewController.placeidUebertragen)/\(ViewComments.commentIDNew)").updateChildValues(["userLikes": userLikesNeu])
})}
func getLikeAndMinusOne () {
let database = Database.database().reference()
database.child("placeID/\(ViewController.placeidUebertragen)/\(ViewComments.commentIDNew)").observeSingleEvent(of: .value, with: { (snapshot) in
let userDict = snapshot.value as! [String: Any]
let userLikes = userDict["userLikes"] as! Int
var userLikesNeu = Int(userLikes)
userLikesNeu = Int(userLikes) - 1
database.child("placeID/\(ViewController.placeidUebertragen)/\(ViewComments.commentIDNew)").updateChildValues(["userLikes": userLikesNeu])
})}
}