How to show SnackBar in class - flutter

Question

i want call snack bar in this class on error method :
class serverRequest {
String _Url = "*****";
Future<String> getRequest(String Url, Map<String, dynamic> map) async {
String BaseUrl = _Url + Url;
var dio = Dio();
print(BaseUrl.toString());
dio.interceptors
.add(InterceptorsWrapper(onRequest: (RequestOptions options) async {
print("REQUEST[${options?.method}] => PATH: ${options?.path}");
return options; //continue
}, onResponse: (Response response) async {
print(
"RESPONSE[${response?.statusCode}] => PATH: ${response?.request?.path}");
return response; // continue
}, onError: (DioError err) async {
print("ERROR[${err.toString()}] => PATH: ${err?.request?.path}");
if (err.response.statusCode == 403) {
// i want call snack bar here
}
return err; //continue
}));
Response response = await dio.post(BaseUrl, queryParameters: map);
print(response.toString());
return response.toString();
}
dynamic requestInterceptor(RequestOptions options) async {
return options;
}
this serverRequest class call in some pages for request and i want when have server error show snack bar in app.

Answer 1

you can add an extra argument to the ```getRequest`` method like so
class serverRequest {
String _Url = "*****";
Future<String> getRequest(String Url, Map<String, dynamic> map, Function onError) async {
////
if (err.response.statusCode == 403) {
// i want call snack bar here
onError(statusCode);
}
and when your calling this function in your widget, you can pass this
Function showErrorSnackBar(errorCode) {
Scaffold.of(context).showSnackBar(
SnackBar(
)
)
}
/// where you call it, pass this function
MaterialButton(
// other props
onPressed: () {
serverRequest().getRequest(x,y, showErrorSnackBar)
}
)