Value not display into multiple picker view - swift

Question

I'm making an app with a viewcontroller that displays two arrays in two different pickerview, an array has the values ​​saved within the application the others are retrieved with rest calls from a rest server. I tried to print the values ​​of the rest server and they are displayed but they are not displayed inside the uipickerview how can I solve this? what is due
class ModificaArticoloMagazzino: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate,UIPickerViewDelegate, UIPickerViewDataSource
{
private var TipologiaUIPicker: UIPickerView = UIPickerView()
private var MagazzinoModUIPicker: UIPickerView = UIPickerView()
private let valori = ["Carico","Scarico","Rimozione","Spostamento"]
private var SetValue:String="Carico"
private var filteredDataMagazzini: [MagazzinoStruct] = []
init() {
super.init(nibName: nil, bundle: nil)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
hideKeyboardWhenTappedAround()
self.view.backgroundColor = UIColor.white
//Caricamento Magazzini
//Caricamento Magazzini
DispatchQueue.main.async {
let mtemp = Magazzino(User: self.u)
mtemp.CaricaMagazzini(completion: { result in
self.filteredDataMagazzini=result
print("\n \n Magazzini caricati: \(result.count)")
//Configurazione Picker View Tipologia Preventivo
self.labelMagazzinoMod = UILabel(frame: CGRect(x: 20, y: 400, width: 120, height: 21))
self.labelMagazzinoMod.font = UIFont(name: "HelveticaNeue-Bold", size: 16.0)
self.labelMagazzinoMod.text = "Magazzino: "
self.view.addSubview(self.labelMagazzinoMod)
self.MagazzinoModUIPicker = UIPickerView(frame: CGRect(x: 150, y: 400, width: 200, height: 50))
self.MagazzinoModUIPicker.delegate = self
self.MagazzinoModUIPicker.dataSource = self
self.MagazzinoModUIPicker.backgroundColor = UIColor.white
self.view.addSubview(self.MagazzinoModUIPicker)
});
}
//Configurazione Picker View Tipologia Preventivo
labelTipologia = UILabel(frame: CGRect(x: 20, y: 270, width: 120, height: 21))
labelTipologia.font = UIFont(name: "HelveticaNeue-Bold", size: 16.0)
labelTipologia.text = "Tipologia: "
self.view.addSubview(labelTipologia)
self.TipologiaUIPicker = UIPickerView(frame: CGRect(x: (self.view.frame.width / 2) - 70, y: 270, width: 200, height: 50))
self.TipologiaUIPicker.delegate = self as UIPickerViewDelegate
self.TipologiaUIPicker.dataSource = self as UIPickerViewDataSource
self.TipologiaUIPicker.backgroundColor = UIColor.white
self.view.addSubview(TipologiaUIPicker)
//Quantita--> labelQuantitaMod e txtQuantita
labelQuantitaMod = UILabel(frame: CGRect(x: 20, y: 220, width: 60, height: 21))
labelQuantitaMod.font = UIFont(name: "HelveticaNeue-Bold", size: 16.0)
labelQuantitaMod.text = "Quantita: "
self.view.addSubview(labelQuantitaMod)
txtQuantita = UITextField(frame: CGRect(x: 120, y: 220, width: 200, height: 21));
txtQuantita.backgroundColor = UIColor.lightGray
txtQuantita.text = "1"
self.view.addSubview(txtQuantita)
}
//Funzione per aggiornare articolo in magazzino
#objc func AggiornaArticoloMagazzino(sender: UIButton!) {
let mtemp = Magazzino(SetArticolo: art, User: u)
if(SetValue=="Carico" || SetValue=="Scarico" || SetValue=="Rimozione"){
mtemp.Aggiorna(Quantita: Int(txtQuantita.text!)!, QuantitaPrecedente: art.Quantita!, IdMagazzino2: 0,Modalita:SetValue, completion: { result in
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1, execute: {
if(result==false){
let alertController = UIAlertController(title: "Errore", message: "\(self.SetValue) non riuscito ", preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: .default, handler: nil)
alertController.addAction(OKAction)
self.present(alertController, animated: true, completion: nil)
}
else{
if(self.SetValue=="Rimozione"){
self.previosScreen()
}
else if(self.SetValue=="Scarico"){
self.art.Quantita=self.art.Quantita!-Int(self.txtQuantita.text!)!
}
else if(self.SetValue=="Carico"){
self.art.Quantita=self.art.Quantita!+Int(self.txtQuantita.text!)!
}
self.labelQuantita.text = "Quantita attuale: \(String(describing: self.art.Quantita!))"
}
});
});
}
else{
mtemp.Aggiorna(Quantita: Int(txtQuantita.text!)!, QuantitaPrecedente: art.Quantita!, IdMagazzino2: 0,Modalita:SetValue, completion: { result in
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1, execute: {
if(result==false){
let alertController = UIAlertController(title: "Errore", message: "\(self.SetValue) non riuscito ", preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: .default, handler: nil)
alertController.addAction(OKAction)
self.present(alertController, animated: true, completion: nil)
}
});
});
}
}
//Questa funzione verifica quale selezione viene effettuata
func CheckSelezione(row: Int){
if(valori[row]=="Carico"){
txtQuantita.isEnabled = true
txtQuantita.isUserInteractionEnabled = true
}
else if(valori[row]=="Scarico"){
txtQuantita.isEnabled = true
txtQuantita.isUserInteractionEnabled = true
}
else if(valori[row]=="Rimozione"){
txtQuantita.isEnabled = false
txtQuantita.isUserInteractionEnabled = false
}
else{
txtQuantita.isEnabled = true
txtQuantita.isUserInteractionEnabled = true
}
SetValue=valori[row]
}
//Funzione per tornare alla schermata principale
func previosScreen(){
let returnView = TabBarViewController()
self.present(returnView, animated: true, completion: nil)
}
#objc func Return(sender: UIButton!) {
previosScreen()
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if pickerView == TipologiaUIPicker {
return valori.count
}
else{
return filteredDataMagazzini.count
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if pickerView == TipologiaUIPicker {
CheckSelezione(row: row)
return valori[row]
}
else{
print("\n Nome Magazzino\(filteredDataMagazzini[row].Nome!)")
return filteredDataMagazzini[row].Nome
}
}
}

Answer 1

First of all you need to check result in your API call like how you are getting the data from server. next step is you need to cast your data object into MagazzinoStruct object then you need to append that object into your filteredDataMagazzini array.
Now once you do that you need to reload your MagazzinoModUIPicker pickerview once you complete the first task.
And you need to reload MagazzinoModUIPicker in main queue because you are making an asynchronous call with API.