问题
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
}
}
回答1:
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()
}
来源：https://stackoverflow.com/questions/46639143/swift-json-parse-in-two-pickerview-between-country-and-city