How to show selected JSON values into the pickerview in Swift?

I have a 2 texview and 2 pickerview.I want 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 selected city 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 citylİST(){        if let path = Bundle.main.path(forResource: "city", ofType: "json") {                  let data = try? Data(contentsOf: URL(fileURLWithPath: path), options: .mappedIfSafe)            let jsonResult = try? (JSONSerialization.jsonObject(with: data!, options: .fragmentsAllowed) as! NSDictionary)            if let cityList = jsonResult?.value(forKey: "data") as? NSArray{                for city in cityList{                    if let cityDict = city as? NSDictionary{                        if let cityName = cityDict.value(forKey: "il_adi") as? String{                            self.cityArray.append(cityName)                        }         if let ilceName = cityDict.value(forKey: "ilceler") as? NSArray{          for ilce in ilceName{            if let ilceDict = ilce as? NSDictionary{           if let ilceName = ilceDict.value(forKey: "ilce_adi") as? String{              self.ilceArray.append(ilceName)               print(ilceName)                                    }                                }                            }                        }                    }                }            }                     }        }

my pickerview codes

  extension searchView : UIPickerViewDelegate, UIPickerViewDataSource{    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {        switch pickerView.tag {        case 1:            return cityArray.count        case 2:            return ilceArray.count        default:            return 1        }    }    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {        switch pickerView.tag {        case 1:            return cityArray[row]        case 2:            return ilceArray[row]        default:            return "Data Not Found"        }    }    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {        switch pickerView.tag {        case 1:            searchText.text = cityArray[row]            selectedCity = cityArray[row]         case 2:            ilceText.text = ilceArray[row]            selectedİlce = ilceArray[row]        default:break