Swift: Json parse in two pickerView between country and city

Question

I have two JSON Url. want to parse between two UIPickerView. one UIPickerView for Country, and another one for the city. I have been able to parse JSON in first UIPickerView of Country, in here data is coming perfectly. but I got a thread message in DidSelectRow func when clicking UIPickerView of the city. please try to solve this problem

here is my code.

var arrCountryPicker = [CountryPicker]()

 var arrCitiPicker = [CityPicker]()

    var id = 0
    var country_id = 0

my two URL

let url = URL(string: "http://......./mobile-app/countries")

let url = URL(string: "http://......../mobile-app/city-by-country-id?country_id="+String(country_id))

PickerViewCode

func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {


    var country: Int = arrCountryPicker.count

    if pickerView == cityPickerView {

        country = self.arrCitiPicker.count
    }
    return country
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {

    if pickerView == countryPickerView {

        let titleRow = arrCountryPicker[row].name

        return titleRow

    } else if pickerView == cityPickerView{
        let titleRow = arrCitiPicker[row].name

        return titleRow
    }
    return ""
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

    countryTextField.text = arrCountryPicker[row].name

    if pickerView == countryPickerView {
        self.countryTextField.text = self.arrCountryPicker[row].name
        self.country_id = self.arrCountryPicker[row].id!
        self.countryPickerView.isHidden = true
    }
    else if pickerView == cityPickerView{

Thread about down code is "Thread 1: exc_bad_instruction(code=exc_1386_invop,subcode=0x0)

        self.cityTextField.text = self.arrCitiPicker[row].name

        self.cityPickerView.isHidden = true

    }
    self.view.endEditing(true)
}


func textFieldDidBeginEditing(_ textField: UITextField) {

    if (textField == countryTextField){
        self.countryPickerView.isHidden = false

    }
    else if (textField == cityTextField){
        self.cityPickerView.isHidden = false

    }

}

Make sure your outlets are all connected. It may be that your `cityTextField` outlet isn't connected. — rmaddy, Oct 09 '17 at 05:16
Try if let also. May be value is nil. try https://stackoverflow.com/questions/36871398/thread-1-exc-bad-instruction-code-exc-1386-invop-subcode-0x0 — Jay Patel, Oct 09 '17 at 05:41
@Anbu.Karthik `self.cityTextField.text = self.arrCitiPicker[row].name` in line didselectRow func — Minzu, Oct 09 '17 at 07:36
@Anbu.Karthik what you try to mean please. the cityTextField and countryTextFiled in same class. both pickerView also in same class — Minzu, Oct 09 '17 at 07:47
@Anbu.Karthik my project goes to crash by thread when click cityTexField — Minzu, Oct 09 '17 at 07:49
are you connected the cityTextField.text in your current class — Anbu.Karthik, Oct 09 '17 at 07:52
@Anbu.Karthik i am doing every programmatically. here everything in a class. — Minzu, Oct 09 '17 at 07:55
@Anbu.Karthik how to connect textField in current class.... `self.textField` this is ok — Minzu, Oct 09 '17 at 07:56
@Anbu.Karthik i am Azmal Tech. here i posted my all codes https://chat.stackoverflow.com/rooms/154116/ios-developer — Minzu, Oct 09 '17 at 08:00
@Anbu.Karthik i am go to lunch now because of hungry. i will come a hour later. it is office rule. now i am in office — Minzu, Oct 09 '17 at 08:02
@Anbu.Karthik the thread is gone but now cityPickerView show nothing — Minzu, Oct 09 '17 at 10:30
cityPickerView show nothing means data not shows or error does not shows brp — Anbu.Karthik, Oct 09 '17 at 10:32
@Anbu.Karthik post picture about my project in https://chat.stackoverflow.com/rooms/154116/ios-developer — Minzu, Oct 09 '17 at 12:09
@Anbu.Karthik now i have this " fatal error: Index out of range" — Minzu, Oct 09 '17 at 12:10

Jay Patel · Accepted Answer · 2017-10-09T12:35:49.100

0

You need to update array of city picker whenever you change Country.

In did select of Country picker, Call web service for particular country id and update array of Cities.

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

    //Remove this line
    //txtCountry.text = self.arrCountries[row].name

    if pickerView == CountryPicker {
        self.txtCountry.text = self.arrCountries[row].name
        self.country_id = self.arrCountryPicker[row].id!

        //Update city array according selected country
        self.updateCitiesFor(id: row)

        self.CountryPicker.isHidden = true
    }  else if pickerView == cityPicker {
        self.txtCity.text = self.arrCities[row].name
        self.cityPicker.isHidden = true
    }
    self.view.endEditing(true)
}

func for update arrCitiPicker

func updateCitiesFor(id: Int) {

    let url = URL(string: "http://......../mobile-app/\(id)")

    //Call web service and store cities data of selected country into arrCitiPicker

    //Clear city textfield when country change
    self.txtCity.text = ""     

    //Update City Picker with new data
    cityPicker.reloadAllComponents()
}

edited Oct 09 '17 at 12:35

answered Oct 09 '17 at 05:32

Jay Patel

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thanks for answer. what i have to write for update arrCityPicker – Minzu Oct 09 '17 at 05:49
Call web service for cities and add response data into array. But first print your cities array. Your error may be have nil value. – Jay Patel Oct 09 '17 at 05:59
i got thread on this line `self.cityTextField.text = self.arrCitiPicker[row].name` after use your new code. also console message is `Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.} fatal error: Index out of range` – Minzu Oct 10 '17 at 10:30
Just print your arrCitiPicker after update array in updateCitiesFor() function. What is display in debug area? – Jay Patel Oct 10 '17 at 10:39
it print nothing `print( "city picker \(self.cityPickerDataLoad(id: row))")` – Minzu Oct 10 '17 at 10:49
please come to this chat https://chat.stackoverflow.com/rooms/154116/ios-developer – Minzu Oct 10 '17 at 10:51
now print in debug city picker () city picker () city picker () city picker () – Minzu Oct 10 '17 at 11:05
i am going to contact to my co_worker who make php file – Minzu Oct 10 '17 at 11:54
problem is when do not have data in cityURL. project goes to crash. `if self.arrCitiPicker[row].name != "" { self.cityTextField.text = self.arrCitiPicker[row].name }` got thread in ` if self.arrCitiPicker[row].name != "" { ` – Minzu Oct 11 '17 at 06:26

Swift: Json parse in two pickerView between country and city

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