loadCities method

Implementation

Future<List<CityModel>> loadCities({String assetPath = 'packages/location_picker/assets/city.json'}) async {
  if (_cities != null) return _cities!;

  try {
    final String data = await rootBundle.loadString(assetPath);
    final List<dynamic> jsonList = json.decode(data);
    _cities = jsonList.map((json) => CityModel.fromJson(json)).toList();
    return _cities!;
  } catch (e) {
    throw Exception('Failed to load cities: $e');
  }
}