# 폼과 유효성 검사 (Flutter)

> Form, TextFormField, GlobalKey<FormState>, validators, 포커스 관리, 입력 타입

- 20 면접 질문
- Mid-Level
- [면접 질문: Flutter](https://sharpskill.dev/ko/technologies/flutter/interview-questions.md)

## 1. Flutter에서 Form 위젯의 주요 역할은 무엇입니까?

**답변**

Form 위젯은 여러 폼 필드(FormField)를 그룹화하고 관리하는 컨테이너 역할을 합니다. FormState를 통해 모든 필드를 한 번의 작업으로 검증, 저장, 초기화할 수 있습니다. Form이 없으면 각 필드를 개별적으로 관리해야 합니다.

## 2. 폼 유효성 검사를 트리거하기 위해 FormState에 접근하려면 어떻게 해야 합니까?

**답변**

FormState에 접근하려면 Form의 key 속성에 할당된 GlobalKey<FormState>를 사용해야 합니다. 그런 다음 이 키의 currentState 속성을 통해 FormState와 그 메서드인 validate(), save(), reset()에 접근할 수 있습니다.

## 3. TextField와 TextFormField의 차이점은 무엇입니까?

**답변**

TextFormField는 Form과 통합된 TextField 버전입니다. FormField를 상속하며 FormState.validate()와 자동으로 통합되는 validator 속성을 가집니다. TextField는 Form의 그룹화된 유효성 검사에 직접 참여할 수 없습니다.

## 17개 추가 질문 이용 가능

- TextFormField의 validator 속성은 오류를 나타내기 위해 무엇을 반환합니까?
- Form의 autovalidateMode 속성의 용도는 무엇입니까?

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## 기타 Flutter 면접 주제

- [Dart 기초](https://sharpskill.dev/ko/technologies/flutter/interview-questions/dart-basics.md): 25개 질문, Junior
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- [Flutter 기초](https://sharpskill.dev/ko/technologies/flutter/interview-questions/flutter-fundamentals.md): 18개 질문, Junior
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