Swift Tableview Refresh Error - swift

Question

I get this error:
This is my code:
I am using refresh in the tableView section of the project. What could be causing this error during the refresh?
But in which phase it falls to the fault I could not solve that part
var kategoriId = ""
var refresher = UIRefreshControl()
var arrayKonularData = [konularData]()
let singleton = konularClass.sharedGlobal
override func viewDidLoad() {
super.viewDidLoad()
refresher.attributedTitle = NSAttributedString(string: "Yükleniyor")
refresher.addTarget(self, action: #selector(KonuDetayViewController.refresh), for: UIControlEvents.valueChanged)
self.tableview.addSubview(refresher)
KonulariGetir(sirala: "order by tarih desc")
navigationController?.delegate = self
tableview.layer.cornerRadius = 10
}
func refresh()
{
DispatchQueue.main.async {
if self.segmentControl.selectedSegmentIndex == 0
{
self.arrayKonularData.removeAll()
self.KonulariGetir(sirala: "order by tarih desc")
}
if self.segmentControl.selectedSegmentIndex == 1
{
self.arrayKonularData.removeAll()
self.KonulariGetir(sirala: "order by indirimpuani desc")
}
}
DispatchQueue.main.async {
self.refresher.endRefreshing()
}
}
I am taking data from web service in this section
func KonulariGetir(sirala:String)
{
var request = URLRequest(url: URL(string:"http://212.xxx.xxx.xxx:7001/IndirimiKovala/KonuGetir")!)
request.httpMethod = "POST"
let postString = "filtre="+sirala
request.httpBody = postString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
if error != nil
{
print("error")
}
if let urlContent = data
{
do
{
let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject
if let gelenDizi = jsonResult as? NSArray
{
for i in 0..<gelenDizi.count
{
if let baslik = (gelenDizi[i] as? NSDictionary)?["baslik"] as? String
{
self.singleton.baslik = baslik
}
if let indirimPuani = (gelenDizi[i] as? NSDictionary)?["indirimpuani"] as? Int
{
self.singleton.indirimPuani = String(indirimPuani)
}
if let konuId = (gelenDizi[i] as? NSDictionary)?["id"] as? Int
{
self.singleton.konuId = String(konuId)
}
if let haberVeren = (gelenDizi[i] as? NSDictionary)?["uye"] as? String
{
self.singleton.haberVerenUye = haberVeren
}
if let gelenTarih = (gelenDizi[i] as? NSDictionary)?["tarih"] as? String
{
self.singleton.tarih = gelenTarih
}
if let gelenAktif = (gelenDizi[i] as? NSDictionary)?["aktif"] as? Int
{
self.singleton.aktif = gelenAktif
}
self.arrayKonularData.append(konularData.init(baslik: self.singleton.baslik, indirimPuani: self.singleton.indirimPuani, konuId: self.singleton.konuId,haberVeren:self.singleton.haberVerenUye , tarih:self.singleton.tarih,aktif:self.singleton.aktif))
}
}
DispatchQueue.main.async {
self.tableview.reloadData()
}
}
catch
{
print("server hatası")
}
}
}
task.resume()
}

Answer 1

I guess the problem comes from the part of code where you try to populate tableview. So the possible solution can be in tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) delegate methode check if arrayKonularData array is not empty like this
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier: orderCell, for: indexPath)
if !arrayKonularData.isEmpty {
.....// Your code
}
return cell
}
Another solution (which I thing will be the right solution in your case) add completion function of
func KonulariGetir(sirala:String)
and reload tableview in the completion method