tableview not displaying firebase users - swift

Question

I am having a problem with my tableview not showing prototype cells. I have properly named each cell and Identifier. Here is my current code: (Thanks!)
import UIKit
import Firebase
import FirebaseDatabase
class UsersTableViewController: UITableViewController {
#IBOutlet var tableview: UITableView!
var ref: DatabaseReference!
var user = [User]()
override func viewDidLoad() {
super.viewDidLoad()
getusers()
// Do any additional setup after loading the view.
}
func getusers() {
let ref = Database.database().reference()
ref.child("users").child(Auth.auth().currentUser!.uid).queryOrderedByKey().observeSingleEvent(of: .value, with: { (snapshot) in
let users = snapshot.value as? [String : AnyObject] ?? [:]
for (_, value) in users
{
if let uid = users["uid"] as? String
{
if uid != Auth.auth().currentUser!.uid
{
let showUser = User()
if let fullname = users["fullname"] as? String, let imagePath = users["urlImage"] as? String
{
showUser.fullname = fullname
showUser.imagePath = imagePath
showUser.userID = uid
self.user.append(showUser)
}
}
}
}
self.tableview.reloadData()
})
ref.removeAllObservers()
}
override func numberOfSections(in tableview: UITableView) -> Int {
return 1
}
override func tableView(_ tableview: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! UserCell
cell.nameLabel.text = self.user[indexPath.row].fullname
cell.UserID = self.user[indexPath.row].userID
cell.userImage.downloadImage(from: self.user[indexPath.row].imagePath!)
checkFollowing(indexPath: indexPath)
return cell
}
override func tableView(_ tableview: UITableView, numberOfRowsInSection section: Int) -> Int {
return user.count
}
override func tableView(_ tableview: UITableView, didSelectRowAt indexPath: IndexPath) {
let uid = Auth.auth().currentUser!.uid
let ref = Database.database().reference()
let key = ref.child("users").childByAutoId().key
var isFollower = false
ref.child("users").child(uid).child("following").queryOrderedByKey().observeSingleEvent(of: .value, with: { snapshot in
if let following = snapshot.value as? [String : AnyObject] {
for (ke, value) in following {
if value as! String == self.user[indexPath.row].userID {
isFollower = true
ref.child("users").child(uid).child("following/\(ke)").removeValue()
ref.child("users").child(self.user[indexPath.row].userID).child("followers/\(ke)").removeValue()
self.tableview.cellForRow(at: indexPath)?.accessoryType = .none
}
}
}
if !isFollower {
let following = ["following/\(key)" : self.user[indexPath.row].userID]
let followers = ["followers/\(key)" : uid]
ref.child("users").child(uid).updateChildValues(following)
ref.child("users").child(self.user[indexPath.row].userID).updateChildValues(followers)
self.tableview.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
})
ref.removeAllObservers()
}
func checkFollowing(indexPath: IndexPath) {
let uid = Auth.auth().currentUser!.uid
let ref = Database.database().reference()
ref.child("users").child(uid).child("following").queryOrderedByKey().observeSingleEvent(of: .value, with: { snapshot in
if let following = snapshot.value as? [String : AnyObject] {
for (_, value) in following {
if value as! String == self.user[indexPath.row].userID {
self.tableview.cellForRow(at: indexPath)?.accessoryType = .checkmark
}
}
}
})
ref.removeAllObservers()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
I am currently using Google's Firebase API for user storage. In this code I am trying to fetch users to my tableview, only my table view is not displaying any information. Thank you in advance if you are able to help!

Answer 1

Remove ref.removeAllObservers() line. Method observeSingleEvent removes observers automatically after completion execution. So in your case ref.removeAllObservers() can remove them before completion invokes and therefore any code in completion doesn't execute.