FCViewController.swift

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    // Dequeue cell
    let cell = self.clientTable .dequeueReusableCell(withIdentifier: "tableViewCell", for: indexPath)
    // Unpack message from Firebase DataSnapshot
    let messageSnapshot: FIRDataSnapshot! = self.messages[indexPath.row]
    let message = messageSnapshot.value as! Dictionary<String, String>
    let name = message[Constants.MessageFields.name] as String!
    if let imageURL = message[Constants.MessageFields.imageURL] {
      if imageURL.hasPrefix("gs://") {
        FIRStorage.storage().reference(forURL: imageURL).data(withMaxSize: INT64_MAX){ (data, error) in
          if let error = error {
            print("Error downloading: \(error)")
            return
          }
          cell.imageView?.image = UIImage.init(data: data!)
        }
      } else if let URL = URL(string: imageURL), let data = try? Data(contentsOf: URL) {
        cell.imageView?.image = UIImage.init(data: data)
      }
      cell.textLabel?.text = "sent by: \(name)"
    } else {
      let text = message[Constants.MessageFields.text] as String!
      cell.textLabel?.text = name! + ": " + text!
      cell.imageView?.image = UIImage(named: "ic_account_circle")
      if let photoURL = message[Constants.MessageFields.photoURL], let URL = URL(string: photoURL), let data = try? Data(contentsOf: URL) {
        cell.imageView?.image = UIImage(data: data)
      }
    }
    return cell
  }