How to show selected JSON data in the pickerview?

I have a 2 textviews and 2 pickerviews. I want the user to select the city and district of that city. When I select the city I want to list the districts of that city in the pickerview. I don't use city model.

When the city is selected, I want the districts of that city to appear in pickerview. How to do this?

My JSON data:

{"data": [    {"il_adi": "Adana",          -- cityNames"plaka_kodu": " 01","alan_kodu": "0322","nufus": "2.274.106","bolge": "Akdeniz","yuzolcumu": "13.844","nufus_artisi": "4,7%","erkek_nufus_yuzde": "49.15%","erkek_nufus": "1.106.811","kadin_nufus_yuzde": "50.15%","kadin_nufus": "1.113.314","nufus_yuzdesi_genel": "2,71%","ilceler": [                    --         districts         {"plaka_kodu": "1","ilce_kodu": "1757","il_adi": "ADANA","ilce_adi": "ALADAĞ",       --- district name"nufus": "15.855","erkek_nufus": "8.194","kadin_nufus": "7.661"        }

My data function:

func ilce(){    guard let path = Bundle.main.path(forResource: "yusif", ofType: "json") else {return}    let url = URL(fileURLWithPath: path)    do{        let jsonData = try Data(contentsOf: url)        selectedCity = try JSONDecoder().decode(cityOfModel.self, from: jsonData)        if let selectedCity = selectedCity{            print(selectedCity)        }    } catch{        print("hataaaaa")    }}

My pickerview code:

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {    switch pickerView.tag {    case 1:        return selectedCity!.data.count    case 2:        return ????     default :        return 0    }}func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {    switch pickerView.tag {        case 1:            return selectedCity!.data[row].ilAdi        case 2:            return selectedCity!.data[row].ilceler[row].ilceAdi        default:            return "HATA"    }}

My model:

struct cityOfModel: Codable {    let data: [Datum]}// MARK: - Datumstruct Datum: Codable {    let ilAdi, plakaKodu, alanKodu, nufus: String    let bolge: Bolge    let yuzolcumu, nufusArtisi, erkekNufusYuzde, erkekNufus: String    let kadinNufusYuzde, kadinNufus, nufusYuzdesiGenel: String    let ilceler: [Ilceler]    let kisaBilgi: String    enum CodingKeys: String, CodingKey {        case ilAdi = "il_adi"        case plakaKodu = "plaka_kodu"        case alanKodu = "alan_kodu"        case nufus, bolge, yuzolcumu        case nufusArtisi = "nufus_artisi"        case erkekNufusYuzde = "erkek_nufus_yuzde"        case erkekNufus = "erkek_nufus"        case kadinNufusYuzde = "kadin_nufus_yuzde"        case kadinNufus = "kadin_nufus"        case nufusYuzdesiGenel = "nufus_yuzdesi_genel"        case ilceler        case kisaBilgi = "kisa_bilgi"    }}enum Bolge: String, Codable {    case akdeniz = "Akdeniz"    case bolgeDoğuAnadolu = "Doğu Anadolu "    case doğuAnadolu = "Doğu Anadolu"    case ege = "Ege"    case güneydoğuAnadolu = "Güneydoğu Anadolu"    case i̇çAnadolu = "İç Anadolu"    case karadeniz = "Karadeniz"    case marmara = "Marmara"}// MARK: - Ilcelerstruct Ilceler: Codable {    let plakaKodu, ilceKodu, ilAdi, ilceAdi: String    let nufus, erkekNufus, kadinNufus: String    enum CodingKeys: String, CodingKey {        case plakaKodu = "plaka_kodu"        case ilceKodu = "ilce_kodu"        case ilAdi = "il_adi"        case ilceAdi = "ilce_adi"        case nufus        case erkekNufus = "erkek_nufus"        case kadinNufus = "kadin_nufus"    }}