TableViewCell.xib doesn't appear on tableview - swift

Question

Here is my code, it is supposed to display the users inside firebase database in customs tableviewcell.xib but when launching the app the tableview stays empty, I really don't know what's wrong in the code or what's missing, I think it is a really simple mistake but I can't figure it out.
Thanks in advance for those who will answer.
import UIKit
import Firebase
class UsersTableView: UIViewController, UITableViewDelegate, UITableViewDataSource {
// Outlets.
#IBOutlet weak var tableview: UITableView!
// Var.
var user = [User]()
override func viewDidLoad() {
super.viewDidLoad()
retrieveUsers()
// Do any additional setup after loading the view.
}
func retrieveUsers() {
let ref = Database.database().reference()
ref.child("users").queryOrderedByKey().observeSingleEvent(of: .value, with: { DataSnapshot in
let users = DataSnapshot.value as! [String: AnyObject]
self.user.removeAll()
for (_, value) in users{
//let uid = Auth.auth().currentUser!.uid
if let uid = value["userID"] as? String{
if uid != Auth.auth().currentUser!.uid {
let userToShow = User()
if let fullName = value["username"] as? String , let imagePath = value["photoURL"] as? String {
userToShow.username = fullName
userToShow.imagePath = imagePath
userToShow.userID = uid
self.user.append(userToShow)
}
}
}
}
self.tableview.reloadData()
})
ref.removeAllObservers()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
let cell = tableview.dequeueReusableCell(withIdentifier: "UserCell", for: indexPath) as! UserTableViewCell
cell.nameLabel.text = self.user[indexPath.row].username
cell.userID = self.user[indexPath.row].userID
cell.userImage.downloadImage(from: self.user[indexPath.row].imagePath!)
//checkFollowing(indexPath: indexPath)
return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return user.count ?? 0
}
}
extension UIImageView{
func downloadImage(from imgURL: String!) {
let url = URLRequest(url: URL(string: imgURL)!)
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil{
print(error)
return
}
DispatchQueue.main.async {
self.image = UIImage(data: data!)
}
}
task.resume()
}
}

Answer 1

If you have not set delegate and datasource for your tableView in your storyboard do it programmatically:
override func viewDidLoad() {
super.viewDidLoad()
//Add these 2 lines, might be missed.
self.tableview.delegate = self
self.tableview.dataSource = self
retrieveUsers()
}

Answer 2

CheckList:
Set tableView Delegate and Datasource
self.tableview.delegate = self
self.tableview.dataSource = self
Registered custom tableViewCell?
let cellNIb = UINib.init(nibName:"Identifier_Name", bundle: nil)
register(cellNIb, forCellReuseIdentifier: identifier)
check the return count of func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
​

Answer 3

There are two things that you forgot:
Set dataSource of your table view as your controller. If you don't do it, your tableView won't want any data. So set it in controller's viewDidLoad
tableview.dataSource = self
If you created custom xib for your cell, don't forget to register your custom cell for table view (also you can do it in viewDidLoad)
tableview.register(UINib(nibName: "UserCardTableViewCell", bundle: nil), forCellReuseIdentifier: "UserCell")
If you need UITableViewDelegate methods like didSelectRowAt too, don't forget to set delegate of your table view as your controller too
tableview.delegate = self