Javascript React native-在呈现应用程序组件之前从异步存储获取数据
我正在React Native上创建一个iOS应用程序,希望该应用程序支持多种语言。 当设置目标语言时,应用程序可以工作,但当我再次打开应用程序时,它会显示默认语言。我试图从异步存储中获取定义的语言,但它不反映更改并呈现应用程序组件。我使用上下文api进行本地化 我使用Launchscreen.xib显示启动屏幕,并使用app.js useffect hook中的react native SplashScreen方法SplashScreen.hide()隐藏此启动屏幕,我希望在加载应用程序组件之前设置先前选择的语言 本地化.js文件-Javascript React native-在呈现应用程序组件之前从异步存储获取数据,javascript,react-native,localization,Javascript,React Native,Localization,我正在React Native上创建一个iOS应用程序,希望该应用程序支持多种语言。 当设置目标语言时,应用程序可以工作,但当我再次打开应用程序时,它会显示默认语言。我试图从异步存储中获取定义的语言,但它不反映更改并呈现应用程序组件。我使用上下文api进行本地化 我使用Launchscreen.xib显示启动屏幕,并使用app.js useffect hook中的react native SplashScreen方法SplashScreen.hide()隐藏此启动屏幕,我希望在加载应用程序组件之
import React, {createContext, useState} from 'react';
import * as RNLocalize from 'react-native-localize';
import LocalizedStrings from 'react-native-localization';
import AsyncStorage from '@react-native-community/async-storage';
import en from './translations/en.json';
import de from './translations/de.json';
import bg from './translations/bg.json';
import it from './translations/it.json';
import nl from './translations/nl.json';
import pl from './translations/pl.json';
import pt from './translations/pt.json';
import ru from './translations/ru.json';
import fr from './translations/fr.json';
import es from './translations/es.json';
const APP_LANGUAGE = 'appLanguage';
const DEFAULT_LANGUAGE = 'en';
const languages = {en, de, bg, it, nl, pl, pt, ru, fr, es};
const translations = new LocalizedStrings(languages);
export const LocalizationContext = createContext({
translations,
setAppLanguage: () => {},
appLanguage: DEFAULT_LANGUAGE,
initializeAppLanguage: () => {},
});
export const LocalizationProvider = ({children}) => {
const [appLanguage, setAppLanguage] = useState(DEFAULT_LANGUAGE);
//console.log(appLanguage);
const setLanguage = language => {
translations.setLanguage(language);
setAppLanguage(language);
AsyncStorage.setItem(APP_LANGUAGE, language);
};
const initializeAppLanguage = async () => {
const currentLanguage = await AsyncStorage.getItem(APP_LANGUAGE);
console.log('language' , currentLanguage);
if (currentLanguage === null) {
let localeCode = DEFAULT_LANGUAGE;
const supportedLocaleCodes = translations.getAvailableLanguages();
const phoneLocaleCodes = RNLocalize.getLocales().map(
locale => locale.languageCode,
);
phoneLocaleCodes.some(code => {
if (supportedLocaleCodes.includes(code)) {
localeCode = code;
return true;
}
});
setLanguage(localeCode);
} else {
setLanguage(currentLanguage);
}
onSuccess();
};
return (
<LocalizationContext.Provider
value={{
translations,
setAppLanguage: setLanguage,
appLanguage,
initializeAppLanguage,
}}>
{children}
</LocalizationContext.Provider>
);
};
import React,{createContext,useState}来自“React”;
从“react native localize”导入*作为RNLocalize;
从“react native localization”导入本地化字符串;
从“@react native community/async storage”导入异步存储;
从“./translations/en.json”导入en;
从“/translations/de.json”导入de;
从“./translations/bg.json”导入bg;
从“./translations/it.json”导入它;
从“./translations/nl.json”导入nl;
从“./translations/pl.json”导入pl;
从“./translations/pt.json”导入pt;
从“./translations/ru.json”导入ru;
从“./translations/fr.json”导入fr;
从“./translations/es.json”导入es;
const APP_LANGUAGE='appllanguage';
const DEFAULT_LANGUAGE='en';
常量语言={en,de,bg,it,nl,pl,pt,ru,fr,es};
常量翻译=新本地化字符串(语言);
export const LocalizationContext=createContext({
翻译,
SetApplLanguage:()=>{},
ApplLanguage:默认语言,
initializeAppLanguage:()=>{},
});
导出常量本地化提供程序=({children})=>{
const[ApplLanguage,setApplLanguage]=useState(默认语言);
//console.log(appllanguage);
const setLanguage=语言=>{
翻译。setLanguage(语言);
设置应用语言(语言);
AsyncStorage.setItem(应用程序语言,语言);
};
const initializeaplanguage=async()=>{
const currentLanguage=await AsyncStorage.getItem(应用程序语言);
console.log('language',currentLanguage);
如果(currentLanguage==null){
设localeCode=DEFAULT\u语言;
const supportedLocaleCodes=translations.getAvailableLanguages();
const phoneLocaleCodes=RNLocalize.getLocales().map(
locale=>locale.languageCode,
);
phoneLocaleCodes.some(代码=>{
if(supportedLocaleCodes.includes(代码)){
localeCode=代码;
返回true;
}
});
setLanguage(localeCode);
}否则{
setLanguage(当前语言);
}
onSuccess();
};
返回(
{儿童}
);
};
App.js文件
import React, {useEffect, useContext, useState} from 'react';
import {createStore, combineReducers, applyMiddleware} from 'redux';
import {composeWithDevTools} from 'redux-devtools-extension';
import {Provider} from 'react-redux';
import logger from 'redux-logger';
import ReduxThunk from 'redux-thunk';
import loginReducer from '_store/reducers/login.js';
import transportReducer from '_store/reducers/transport.js';
import gpsReducer from '_store/reducers/gpslogger.js';
import AppNavigator from '_navigations/AppNavigator';
import SplashScreen from 'react-native-splash-screen';
import FlashMessage from 'react-native-flash-message';
import {LocalizationContext} from './Localization';
const rootReducer = combineReducers({
auth: loginReducer,
transport: transportReducer,
gps: gpsReducer
});
const store = createStore(rootReducer, composeWithDevTools(applyMiddleware(logger, ReduxThunk)));
const App = props => {
const {initializeAppLanguage, appLanguage} = useContext(LocalizationContext);
const [loaded, setLoaded] = useState(false);
useEffect(() => {
initializeAppLanguage();
SplashScreen.hide();
}, []);
return (
<Provider store={store}>
<AppNavigator />
<FlashMessage />
</Provider>
);
};
export default App;
import React,{useffect,useContext,useState}来自'React';
从'redux'导入{createStore,combinereducer,applyMiddleware};
从'redux devtools extension'导入{composeWithDevTools};
从'react redux'导入{Provider};
从“redux记录器”导入记录器;
从“redux thunk”导入redux thunk;
从“_store/reducers/login.js”导入loginReducer;
从“_store/reducers/transport.js”导入transportReducer;
从“_store/reducers/gpslogger.js”导入gpsReducer;
从“导航/AppNavigator”导入AppNavigator;
从“react native SplashScreen”导入SplashScreen;
从“react native flash message”导入FlashMessage;
从“./Localization”导入{LocalizationContext};
const rootReducer=combinereducer({
作者:loginReducer,
运输:运输减速器,
gps:gps减速机
});
const store=createStore(rootReducer,composeWithDevTools(applyMiddleware(logger,ReduxThunk));
const App=props=>{
const{initializeAppLanguage,ApplLanguage}=useContext(LocalizationContext);
const[loaded,setLoaded]=useState(false);
useffect(()=>{
初始化aplanguage();
SplashScreen.hide();
}, []);
返回(
);
};
导出默认应用程序;
如何实现所需的行为?我们正在做一些事情,在
app.js中实现相同的所需行为
setI18nConfig = () => {
const {dispatch} = this.store;
const translationGetters = {
ar: () => require("../src/assets/translations/ar.json"),
en: () => require("../src/assets/translations/en.json"),
};
const translate = helpers.translate();
const fallback = { languageTag: "en", isRTL: false };
const { languageTag, isRTL } = this.appLanguage ? this.appLanguage : (RNLocalize.findBestAvailableLanguage(Object.keys(translationGetters)) || fallback)
dispatch(setAppLanguage({
languageTag,
isRTL
}));
if(!this.appLanguage) {
this.appLanguage = {languageTag, isRTL}
}
// clear translation cache
translate.cache.clear();
// set i18n-js config
i18n.translations = { [languageTag]: translationGetters[languageTag]() };
i18n.locale = languageTag;
}
我通过创建一个单独的启动屏幕并在那里放置一个setTimeout方法来解决这个问题。它提供了从异步存储获取数据的时间,然后导航到主应用程序。你好,罗文,感谢您的快速响应。我有几个问题。1.这些助手来自哪里?2.您是否在app.js 3的useffect()钩子中调用此函数。为了翻译所有页面,您使用的是上下文api还是仅此而已?谢谢