logout

들어가기
logout을 굳이 따로 정리할까 말까 고민하다가
token이 깔끔하게 지워지지가 않아서
고생을 해서
정리하기로 함

1. apollo.js

 import {
  makeVar,
  ApolloClient,
  InMemoryCache,
  createHttpLink,
} from '@apollo/client'
import { setContext } from '@apollo/client/link/context'
import { offsetLimitPagination } from '@apollo/client/utilities'
import AsyncStorage from '@react-native-async-storage/async-storage'

export const isLoggedInVar = makeVar(false)
export const tokenVar = makeVar('')
export const TOKEN = 'token'

export const logUserIn = async (token) => {
  await AsyncStorage.setItem(TOKEN, token)
  isLoggedInVar(true)
  tokenVar(token)
}

///AsyncStorage에서 TOKEN을 지워주고, loggedInVar를 false로
///그리고 가장 중요한 tokenVar를 null로 바꿔줌.
export const logUserOut = async () => {
  await AsyncStorage.removeItem(TOKEN)
  isLoggedInVar(false)
  tokenVar(null)
}
.
.
.

2. 사용(search.js-->예시로 여기에 담아둠)

 import React from 'react'
import { Text, View } from 'react-native'
import styled from 'styled-components/native'
import {  logUserOut  } from '../apollo'

const Button = styled.TouchableOpacity`
  background-color: tomato;
  padding: 13px 10px;
  border-radius: 3px;
  width: 100%;
  opacity: ${(props) => (props.disabled ? '0.5' : '1')};
`

export default function Search() {
  return (
    <View
      style={{
        backgroundColor: 'black',
        flex: 1,
        alignItems: 'center',
        justifyContent: 'center',
      }}
    >
      <Text style={{ color: 'white' }}>Search</Text>
      <Button onPress={()=>logUserOut()}>  ///실행되는 부분 참고할 것,반드시 함수형태로 코딩할 것!!
        <Text>Logout</Text>
      </Button>
    </View>
  )
}