initState method
Initialization and disposal methods.
Implementation
void initState(BuildContext context) {
  // airtimePhonenumberControllerValidator =
  //     _airtimePhonenumberControllerValidator;
  amountAirtimeControllerValidator = _amountAirtimeControllerValidator;
  dataPhonenumberControllerValidator = _dataPhonenumberControllerValidator;
  amountDataController1Validator = _amountDataController1Validator;
}