Data from Firebase is not appearing in my TableView.

Question

Created Sep ’20

Replies 2

Boosts 0

Participants 3

For some reason, the data from my FirebaseDatabase is not showing up in my TableView. I've done the "tableView.delegate and tableView.datasource = self", I've registered the "cell". I've even added tested mock arrays like "var postData: [String] = ["delivery", "fun"]" and they have showed up in my tableView. Any idea what I am doing wrong?

import UIKit
import Firebase
import FirebaseDatabase

class NewConversationViewController: UITableViewController {

  var ref: DatabaseReference!

  var userData = [String]()

  override func viewDidLoad() {
    super.viewDidLoad()

    self.tableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")

    ref = Database.database().reference()

    ref.child("users\("name")").observeSingleEvent(of: .childAdded) { (snapshot) in

      let user = snapshot.value as? String

      if let actualUsers = user {
        self.userData.append(actualUsers)

        DispatchQueue.main.async {
          self.tableView.reloadData()
        }
      }
    }



  }



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

  override func tableView( tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
    cell.textLabel?.text = userData[indexPath.row]

    return cell
  }

}

Boost

Answer 1

KMT OP

Sep ’20

Suggest you contact the authors of any 3rd party products directly, vs. expecting that support here. devForums is Apple IDE-centric.

Good luck.

0

Answer 2

Claude31 OP

Sep ’20

You should format your code with the code formatter tool (<>)

Code Block import UIKit
import Firebase
import FirebaseDatabase
class NewConversationViewController: UITableViewController {
   
  var ref: DatabaseReference!
  var userData = [String]()
   
  override func viewDidLoad() {
    super.viewDidLoad()
     
    self.tableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
     
    ref = Database.database().reference()
    ref.child("users\("name")").observeSingleEvent(of: .childAdded) { (snapshot) in
       
      let user = snapshot.value as? String
       
      if let actualUsers = user {
        self.userData.append(actualUsers)
         
        DispatchQueue.main.async {
          self.tableView.reloadData()
        }
      }
    }
     
  }
   
  override func tableView( tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return userData.count
  }
   
  override func tableView( tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
    cell.textLabel?.text = userData[indexPath.row]
     
    return cell
  }
}

Have you tested user for nil on line 18 ?
Add the following on line 19
print("user is", user).
I suspect you get nil, which would mean you don't get correct content in snapshot, or that this content is not yet loaded when you try to use it).

0