tableView not showing the data in an array swift - swift

Question

I have a tableView connected to the array. The array isn't empty but the tableView shows nothing other than lines. Can you help me, please?
var invoicesDictionary = [String:[String]]()
var invoicesSectionTitles = [String]()
var invoices: [String] = ["JV1", "R1", "JV2"]
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
for invoice in invoices {
let invoiceKey = String(invoice.prefix(1))
if var invoiceValues = self.invoicesDictionary[invoiceKey] {
invoiceValues.append(invoice)
self.invoicesDictionary[invoiceKey] = invoiceValues
} else {
self.invoicesDictionary[invoiceKey] = [invoice]
}
}
invoicesSectionTitles = [String](invoicesDictionary.keys)
invoicesSectionTitles = invoicesSectionTitles.sorted(by: { $0 < $1 })
tableView.reloadData()
}
func numberOfSections(in tableView: UITableView) -> Int {
return invoicesSectionTitles.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let invoiceKey = invoicesSectionTitles[section]
if let invoiceValues = invoicesDictionary[invoiceKey] {
return invoiceValues.count
}
return 0
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
let invoiceKey = invoicesSectionTitles[indexPath.section]
if let invoiceValues = invoicesDictionary[invoiceKey] {
cell.textLabel?.text = invoiceValues[indexPath.row]
}
return cell
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return invoicesSectionTitles[section]
}
func sectionIndexTitles(for tableView: UITableView) -> [String]? {
return invoicesSectionTitles
}
I printed out the array which is without a doubt not empty. I tried this code on an another project and it just worked.

Answer 1

You have to put this in viewDidLoad :
tableView.delegate = self
tableView.dataSource = self

Answer 2

You have to tell the View controller that it's the delegate or assigned VC for the table View functionality by passing the following lines inside viewDidLoad()
tableView.delegate = self
tableView.dataSource = self