# 위젯 생명주기 (Flutter)

> StatefulWidget 생명주기, initState, setState, dispose, didUpdateWidget, build 최적화

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

## 1. StatefulWidget을 생성할 때 가장 먼저 호출되는 메서드는 무엇입니까?

**답변**

createState() 메서드는 StatefulWidget을 인스턴스화할 때 가장 먼저 호출됩니다. 이 메서드는 위젯과 연결된 State 객체를 생성합니다. 위젯이 위젯 트리에 처음 삽입될 때 Flutter 프레임워크에 의해 자동으로 호출됩니다.

## 2. StatefulWidget가 생성될 때 라이프사이클 메서드의 올바른 순서는 무엇입니까?

**답변**

올바른 순서는 다음과 같습니다. createState()가 State 객체를 생성하고, 그다음 initState()가 상태를 초기화하며, didChangeDependencies()는 initState 이후와 의존성이 변경될 때마다 호출되고, 마지막으로 build()가 UI를 구성합니다. 이 순서는 렌더링 전에 상태가 올바르게 초기화되도록 보장합니다.

## 3. initState() 메서드의 주요 목적은 무엇입니까?

**답변**

initState()는 컨텍스트에 의존하는 데이터를 초기화하거나 리스너, 애니메이션 컨트롤러, 구독을 설정하는 데 사용됩니다. 이 메서드는 State 객체가 생성될 때 한 번만 호출되므로 일회성 초기화에 이상적인 위치입니다.

## 17개 추가 질문 이용 가능

- initState() 안에서 super.initState()를 호출하는 것이 필수인 이유는 무엇입니까?
- StatefulWidget에서 setState()가 호출되면 어떤 일이 발생합니까?

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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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