Swift 3.1 Label in TableViewCell - unexpectedly found nil - swift3

Question

I'm trying to create two tableViews in one UIViewController. But when I'm trying to assign value to UILabel, getting an error: fatal error: unexpectedly found nil while unwrapping an Optional value
I wonder why, I have almost the same code for TableViewController with one tableView and it works with no issues. It looks like these UI Labels are not initialized when trying to assign value to it. But don't understand how to fix it.
It fails here:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var cell: UITableViewCell?
if tableView == self.guestsTableView {
let cell = tableView.dequeueReusableCell(withIdentifier: "guestCell", for: indexPath) as! GuestAtTableTableViewCell
if let guestsTable = guestsTableFetchedResultsController?.object(at: indexPath) {
print(guestsTable.guestName) // works fine, prints the value
print(cell.guestNameLabel.text) //fails here with error fatal error: unexpectedly found nil while unwrapping an Optional value
cell.guestNameLabel.text = guestsTable.guestName
cell.openTimeLabel.text = String(describing: guestsTable.openTime)
cell.cellDelegate = self
}
}
else if tableView == self.ordersTableView {
cell = tableView.dequeueReusableCell(withIdentifier: "orderCell", for: indexPath)
//to be done
}
// Configure the cell...
return cell!
}
Full code of this class:
import UIKit
import CoreData
class TableUIViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, CellWithButtonDelegate {
//The following two variables will not be nil because prepare for segue will set them
var tableName: String?
var table: TablesTable? = nil
fileprivate var currentTableSession: TableSessionTable? {
get {
let tableSessionTable = TableSessionTable()
return tableSessionTable.getCurrentTableSession(table: table!)
}
}
fileprivate var guestsTableFetchedResultsController: NSFetchedResultsController<GuestsTable>?
fileprivate var ordersTableFetchedResultsController: NSFetchedResultsController<OrdersTable>?
#IBOutlet weak var tableNameLabel: UILabel!
#IBOutlet weak var tableCapacityLabel: UILabel!
#IBOutlet weak var tableCountOfGuestsLabel: UILabel!
#IBOutlet weak var tableDescriptionTextView: UITextView!
#IBAction func closeTableButtonPressed(_ sender: UIButton) {
}
#IBOutlet weak var guestsTableView: UITableView!
#IBOutlet weak var ordersTableView: UITableView!
#IBAction func addGuestButtonPressed(_ sender: UIButton) {
let guestsTable = GuestsTable()
let tablesTable = TablesTable()
let table = Table(tableName: tableName!, tableCapacity: 0, locationX: nil, locationY: nil, tableImage: nil)
try? guestsTable.addNewGuest(table: tablesTable.getOrCreateTable(table: table))
updateUI()
}
#IBAction func addOrderButtonPressed(_ sender: UIButton) {
}
override func viewDidLoad() {
guestsTableView.dataSource = self
guestsTableView.delegate = self
guestsTableView.register(GuestAtTableTableViewCell.self, forCellReuseIdentifier: "guestCell")
ordersTableView.dataSource = self
ordersTableView.delegate = self
ordersTableView.register(UITableViewCell.self, forCellReuseIdentifier: "orderCell")
updateUI()
}
func didPressButton(table: TablesTable) {
}
private func updateUI () {
let tableView = guestsTableView
let context = AppDelegate.viewContext
let request : NSFetchRequest<GuestsTable> = GuestsTable.fetchRequest()
request.predicate = NSPredicate(format: "table= %#", currentTableSession!)
request.sortDescriptors = [NSSortDescriptor(key: "guestName", ascending: true, selector: #selector(NSString.localizedCaseInsensitiveCompare(_:)))]
guestsTableFetchedResultsController = NSFetchedResultsController<GuestsTable>(fetchRequest: request, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
try? guestsTableFetchedResultsController?.performFetch()
tableView?.reloadData()
}
private func updateUI1 () {
let tableView = ordersTableView
let context = AppDelegate.viewContext
let request : NSFetchRequest<OrdersTable> = OrdersTable.fetchRequest()
request.sortDescriptors = [NSSortDescriptor(key: "menuItem", ascending: true, selector: #selector(NSString.localizedCaseInsensitiveCompare(_:)))]
ordersTableFetchedResultsController = NSFetchedResultsController<OrdersTable>(fetchRequest: request, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
try? ordersTableFetchedResultsController?.performFetch()
tableView?.reloadData()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var cell: UITableViewCell?
if tableView == self.guestsTableView {
let cell = tableView.dequeueReusableCell(withIdentifier: "guestCell", for: indexPath) as! GuestAtTableTableViewCell
if let guestsTable = guestsTableFetchedResultsController?.object(at: indexPath) {
print(guestsTable.guestName) // works fine, prints the value
print(cell.guestNameLabel.text) //fails here with error fatal error: unexpectedly found nil while unwrapping an Optional value
cell.guestNameLabel.text = guestsTable.guestName
cell.openTimeLabel.text = String(describing: guestsTable.openTime)
cell.cellDelegate = self
}
}
else if tableView == self.ordersTableView {
cell = tableView.dequeueReusableCell(withIdentifier: "orderCell", for: indexPath)
//to be done
}
// Configure the cell...
return cell!
}
func numberOfSections(in tableView: UITableView) -> Int {
if tableView == self.guestsTableView {
return guestsTableFetchedResultsController?.sections?.count ?? 1
}
else if tableView == self.ordersTableView {
return ordersTableFetchedResultsController?.sections?.count ?? 1
}
else {return 1}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if tableView == self.guestsTableView {
if let sections = guestsTableFetchedResultsController?.sections, sections.count > 0 {
return sections[section].numberOfObjects
}
else {
return 0
}
}
else if tableView == self.ordersTableView {
if let sections = ordersTableFetchedResultsController?.sections, sections.count > 0 {
return sections[section].numberOfObjects
}
else {
return 0
}
}
else {return 0}
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
if tableView == self.guestsTableView {
if let sections = guestsTableFetchedResultsController?.sections, sections.count > 0 {
return sections[section].name
}
else {
return nil
}
}
else if tableView == self.ordersTableView {
if let sections = ordersTableFetchedResultsController?.sections, sections.count > 0 {
return sections[section].name
}
else {
return nil
}
}
else {return nil}
}
func sectionIndexTitles(for tableView: UITableView) -> [String]? {
if tableView == guestsTableView {
return guestsTableFetchedResultsController?.sectionIndexTitles
}
else {
return ordersTableFetchedResultsController?.sectionIndexTitles
}
}
func tableView(_ tableView: UITableView, sectionForSectionIndexTitle title: String, at index: Int) -> Int {
if tableView == guestsTableView {
return guestsTableFetchedResultsController?.section(forSectionIndexTitle: title, at: index) ?? 0
}
else if tableView == ordersTableView {
return ordersTableFetchedResultsController?.section(forSectionIndexTitle: title, at: index) ?? 0
}
else {return 0}
}
}
And full code of UITableViewCell class:
import UIKit
class GuestAtTableTableViewCell: UITableViewCell {
weak var cellDelegate: CellWithButtonDelegate?
#IBOutlet weak var guestNameLabel: UILabel!
#IBOutlet weak var openTimeLabel: UILabel!
#IBAction func didPressButton(_ sender: UIButton) {
}
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}

Answer 1

I guess you have a xib for your UITableViewCell register the xib instead of the class.
Use the following:
guestsTableView.register(UINib.init(nibName: "GuestAtTableTableViewCell", bundle: nil), forCellReuseIdentifier: "guestCell")
As you have created a prototype cell in the storyboard itself you should select the cell in the storyboard and set its identifier there. Next remove the register line from your code for guestCell. It should work