# 애플리케이션 생명주기 (Flutter)

> AppLifecycleState, WidgetsBindingObserver, 백그라운드/포그라운드, 앱 종료

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

## 1. Flutter 앱의 생명주기 상태 변화를 관찰하려면 어떤 mixin을 사용해야 하나요?

**답변**

WidgetsBindingObserver는 앱의 생명주기 상태 변화를 관찰하기 위한 Flutter 공식 mixin입니다. State 클래스에 추가하고 initState에서 WidgetsBinding.instance.addObserver로 옵저버를 등록한 다음, dispose에서 제거해야 합니다.

## 2. 앱의 생명주기 상태가 변경될 때 호출되는 WidgetsBindingObserver 메서드는 무엇인가요?

**답변**

didChangeAppLifecycleState 메서드는 앱의 생명주기 상태가 변경될 때마다 호출됩니다. 애플리케이션의 새로운 상태(resumed, inactive, paused, detached, hidden)를 나타내는 AppLifecycleState 매개변수를 받습니다.

## 3. 앱이 화면에 보이고 사용자 입력에 응답하고 있음을 나타내는 AppLifecycleState는 무엇인가요?

**답변**

resumed 상태는 앱이 화면에 보이고 포그라운드에 있으며 사용자 입력에 응답하고 있음을 나타냅니다. 이는 사용자가 애플리케이션과 적극적으로 상호작용하는 정상적인 작동 상태입니다.

## 17개 추가 질문 이용 가능

- iOS에서 AppLifecycleState.inactive 상태는 언제 발생하나요?
- 앱이 더 이상 사용자에게 보이지 않음을 나타내는 AppLifecycleState는 무엇인가요?

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## 기타 Flutter 면접 주제

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