form_field_validator

1. pub.dev site에서 form_field_validator 검색 및 pubspec.yaml 에 install 합니다.

This report is effective as of MAY 21, 2021.

dependencies:
  form_field_validator: ^1.1.0

2. pub get
3. as below

    import 'package:form_field_validator/form_field_validator.dart';
        <省略>
    final formKey = GlobalKey<FormState>();
        <省略>
    TextFormField(
      validator: RequiredValidator(errorText: "fill in"),                
    ),
        <省略>
    onPressed: () {
　    if (formKey.currentState.validate())　{　formKey.currentState.save();
    print("확인 = ~~);
    }

4. Email Validator 부분은 아래처럼 변경하면 빈칸일때와 형식에 맞는 지 확인할 수 있습니다.

as below example

validator: MultiValidator([
 EmailValidator(errorText: "이메일 형식에 맞질 않습니다."),
 RequiredValidator(errorText: "이메일을 입력하세요")
]),

cf. keyboardType: TextInputType.emailAddress

End
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