validate method
Implementation
@override
String? validate(String? value, bool required, Map<String, dynamic> data) {
if (!required) {
if (value == null) {
return null;
}
} else if (value != null &&
value.isNotEmpty &&
!MyStringUtils.isEmail(value)) {
return "Por favor informe um email vĂ¡lido";
}
return null;
}