如何自动重新加载tableview

Question

Hi I am doing a post screen where users add post and view them.This is the viewcontroller for viewing. I am getting information from firebase and reload that info to my table view cells everything is going perfect. However to reload the screen and see if my posts are up to date I need to close the application and run it again each time although I use .reloadData() function and it doesn't reload automatically after each posting. here is my code where do I do the mistake? or am I missing something?

override func viewDidLoad() {
    super.viewDidLoad()
    self.navcik.title = "Posts"
    tableView = UITableView(frame:view.bounds, style: .plain)
    view.addSubview(tableView)
    let cellnib = UINib(nibName: "postTableCell", bundle: nil)
    tableView.register(cellnib, forCellReuseIdentifier: "postCell")

    tableView.delegate = self
    tableView.dataSource = self
    tableView.reloadData()
    observeposts()
}
func observeposts() {
    let db = Firestore.firestore()
    db.collection("posts").getDocuments { (snap, error) in
        var tempposts = [Post]()
        if error != nil {
            print("error:\(String(describing: error))")
        } else {
            for document in snap!.documents {
                if let dict = document.data() as? [String: Any] ,
                let username = dict["username"] as? String,
                let title = dict["title"] as? String,
                    let desc = dict["desc"] as? String {
                    let post = Post(id: "1", username: username, title: title, desc: desc)
                    tempposts.append(post)
                }

            }
            self.posts = tempposts
            self.tableView.reloadData()
        }

    }
}
@IBOutlet weak var navcik: UINavigationItem!

func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return posts.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "postCell", for: indexPath) as! postTableCell
    cell.set(post: posts[indexPath.row])
    return cell
}

Answer 1

好吧，我只是添加了一个复习并观察了那里的帖子并重新加载，现在工作完美。

Answer 2

try this

 for document in snap!.documents {
            if let dict = document.data() as? [String: Any] ,
            let username = dict["username"] as? String,
            let title = dict["title"] as? String,
                let desc = dict["desc"] as? String {
                let post = Post(id: "1", username: username, title: title, desc: desc)
                tempposts.append(post)
            }
            tableView.reloadData()
        }