react-native - 类型错误 : undefined is not an object (evaluating '_asyncStorage.AsyncStorage.setItem' )

Question

版本:

@react-native-community/async-storage = ^1.6.1

问题:

1. 像这样导入 AsyncStorage:

import { AsyncStorage } from '@react-native-community/async-storage'

在我的代码中使用如下:

AsyncStorage.setItem('locale', locale)

AsyncStorage.getItem('user').then((value) => 
{
...
}

错误:

1. 类型错误:未定义不是一个对象(正在评估'_asyncStorage.AsyncStorage.setItem')
2. 类型错误:未定义不是对象(正在计算“_asyncStorage.AsyncStorage.getItem”)

我尝试过的

1. 从“react-native”导入 AsyncStorage 不会出现任何问题，只是警告应从“@react-native-community”导入 AsyncStorage，因为 'react-native' 中的 AsyncStorage 已弃用。
2. 尝试卸载并重新安装“@react-native-community/async-storage”依赖项，但没有成功。
3. 谷歌搜索

完整代码:

import React from 'react';
import { View, Image, NativeModules } from 'react-native';
import { AsyncStorage } from '@react-native-community/async-storage'
import { styles } from '../../components/Styles.js';
import { GEOLocation } from '../../scripts/GEOLocation';
import Moment from 'moment/min/moment-with-locales';

export default class SplashScreen extends React.Component {


  constructor(props) {
    super(props);
    this.geo = new GEOLocation();
    this.setLocale();
    this.bootstrapAsync();
  }


  bootstrapAsync = async () => {

    this.geo.grantAccess()

    AsyncStorage.getItem('user').then((value) => {
      const user = JSON.parse(value);
      this.props.navigation.navigate(user ? 'App' : 'Auth');
    })
  };

  setLocale = () => {
    const deviceLocale = NativeModules.I18nManager.localeIdentifier
    var locale;

    if (deviceLocale.includes('_')) {
      var language = deviceLocale.split('_')[0]
      var country = deviceLocale.split('_')[1].toLowerCase()

      locale = language + '-' + country
    } else {
      locale = deviceLocale
    }

    if(Moment.locales().indexOf(locale) > -1 ) {
      console.log('device locale')
      AsyncStorage.setItem('locale', locale)
    } else {
      console.log('default locale')
      AsyncStorage.setItem('locale', 'en')
    }
  }


  render() {
    return (
      <View style={styles.container}>
        <Image style={styles.leImage} source={require('../../../assets/logo_icon.png')} />
      </View>
    )
  }
}

Answer 1

以下是如何使用正确的导入方法。

import AsyncStorage from '@react-native-community/async-storage';

此模块未导出为 react-native，因此它不能有方括号。

在react-native模块中使用

import { AsyncStorage } from 'react-native';