React native Redux Persist-如何有条件地将存储持久化为react native
我想设置一个条件,要么完全保留/重新水化存储,要么不基于应用程序是否正在从错误中恢复 在顶级组件(app.js)中,我导入了store和persistor(来自MyStore.js),并将应用程序的其余部分包装到Provider和PersistGate中。存储在一个单独的文件中,因此它可以被一些共享逻辑文件导入和读取 当应用程序组件加载时,它会检查异步存储以查看是否正在从错误中恢复,并更新状态。我希望该状态确定存储是否持久化 我想听听你的建议React native Redux Persist-如何有条件地将存储持久化为react native,react-native,react-redux,redux-persist,React Native,React Redux,Redux Persist,我想设置一个条件,要么完全保留/重新水化存储,要么不基于应用程序是否正在从错误中恢复 在顶级组件(app.js)中,我导入了store和persistor(来自MyStore.js),并将应用程序的其余部分包装到Provider和PersistGate中。存储在一个单独的文件中,因此它可以被一些共享逻辑文件导入和读取 当应用程序组件加载时,它会检查异步存储以查看是否正在从错误中恢复,并更新状态。我希望该状态确定存储是否持久化 我想听听你的建议 // ......... App.js: comp
// ......... App.js:
componentDidMount = () => { this.checkForPreviousFatalError() }
checkForPreviousFatalError = async () => {
var array = null
try {
array = await AsyncStorage.multiGet(['@lastFatalErrorEpoch', '@previousFatalErrorEpoch'])
} catch(e) {
console.log( "Unable to retrieve date of last 2 errors: " + e );
}
const lastError = array[0][1];
const prevError = array[1][1];
if ( lastError && prevError && parseInt(prevError) + 60000 > parseInt(lastError) ) {
// do not persist store
} else {
// persist store
};
}
render() {
const waitingElement = (
<ImageBackground source={require('./assets/signInBackground.jpg')} style={[ Styles.flexCenter, Styles.flexColumn, { height: "100%" }]}>
<Text style={{ fontSize: 18, marginBottom: 20 }} >{ EnglishNA.RestoringLocalData }</Text>
<Spinner size='large' flexZero={ true } color="white" />
</ImageBackground>
)
return (
<Provider store={ store }>
<PersistGate loading={ waitingElement } persistor={ persistor }>
<LogIn />
</PersistGate>
</Provider>
)
}
}
// ....... MyStore.js
import ReduxThunk from 'redux-thunk';
import { createStore, applyMiddleware } from 'redux';
import ServerCall from './services/ServerCall';
import rootReducer from './reducers';
import { persistStore, persistReducer } from 'redux-persist';
import storage from 'redux-persist/lib/storage';
import autoMergeLevel2 from 'redux-persist/lib/stateReconciler/autoMergeLevel2';
const persistConfig = {
key: 'root',
storage: storage,
stateReconciler: autoMergeLevel2 // see "Merge Process" section for details.
};
const pReducer = persistReducer(persistConfig, rootReducer);
export const store = createStore( pReducer, applyMiddleware( ReduxThunk, ServerCall ) );
export const persistor = persistStore(store);
/。。。。。。。。。App.js:
componentDidMount=()=>{this.checkForPreviousFatalError()}
checkForPreviousFatalError=async()=>{
变量数组=null
试一试{
array=await AsyncStorage.multiGet(['@LastFatalErrorRepoch','@PreviousFatalErrorRepoch']))
}捕获(e){
console.log(“无法检索最近2个错误的日期:+e”);
}
const lastError=数组[0][1];
const preveror=数组[1][1];
if(lastError&&prevError&&parseInt(prevError)+60000>parseInt(lastError)){
//不要坚持存储
}否则{
//持久存储
};
}
render(){
常量waitingElement=(
{EnglishNA.RestoringLocalData}
)
返回(
)
}
}
// ....... MyStore.js
从“redux thunk”导入redux thunk;
从“redux”导入{createStore,applyMiddleware};
从“./services/ServerCall”导入ServerCall;
从“./reducers”导入rootReducer;
从“redux persist”导入{persistStore,persistReducer};
从“redux persist/lib/storage”导入存储;
从“redux persist/lib/stateconciler/autoMergeLevel2”导入autoMergeLevel2;
常量persistConfig={
键:'根',
存储:存储,
StateConciler:autoMergeLevel2//有关详细信息,请参阅“合并进程”部分。
};
const pReducer=persistReducer(persistConfig,rootReducer);
export const store=createStore(pReducer、applyMiddleware(ReduxThunk、ServerCall));
export const persistor=persistStore(存储);
调用函数检查以前的致命错误后,应配置存储。如果出现错误,请不要持久存储,也不要在存储中使用persistReducer
。对于加载,可以使用组件状态
像这样:
const pReducer = persist
? persistReducer(persistConfig, rootReducer)
: rootReducer;
App.js
// ......... App.js:
import configureStore from "./MyStore.js";
//....................
state = {
isLoading: true,
store: null
};
componentDidMount = () => { this.checkForPreviousFatalError() }
checkForPreviousFatalError = async () => {
var array = null
try {
array = await AsyncStorage.multiGet(['@lastFatalErrorEpoch', '@previousFatalErrorEpoch'])
} catch(e) {
console.log( "Unable to retrieve date of last 2 errors: " + e );
}
const lastError = array[0][1];
const prevError = array[1][1];
if ( lastError && prevError && parseInt(prevError) + 60000 > parseInt(lastError) ) {
this.configureStore(false)
// do not persist store
} else {
this.configureStore(true)
// persist store
};
}
configureStore = (persist) => {
configureStore(persist, store => {
this.setState({ isLoading: false, store });
});
}
render() {
if (this.state.isLoading) {
return <ImageBackground source={require('./assets/signInBackground.jpg')} style={[ Styles.flexCenter, Styles.flexColumn, { height: "100%" }]}>
<Text style={{ fontSize: 18, marginBottom: 20 }} >{ EnglishNA.RestoringLocalData }</Text>
<Spinner size='large' flexZero={ true } color="white" />
</ImageBackground>;
}
return (
<View style={{ flex: 1 }}>
<Provider store={this.state.store}>
<AppNavigator />
</Provider>
{this._renderStatusBarIos()}
<MessageBar />
</View>
);
}
如果要导出存储,请在MyStore.js中创建一个函数
export function getStore() {
return store;
}
谢谢Mehran,一个问题。我将存储逻辑分离到它自己的文件中的原因是,我可以将存储导入到其他(非redux)组件中。在您建议的代码中,似乎不再导出store元素。“我读对了吗?”乔菲特回答道。如果有帮助,请向上投票并标记回答是否正确谢谢Mehran,我只需在MyStore中的configureStore函数上添加一个条件,用于它没有被持久化:if(doPersistStore){persistStore(store,null,()=>onComplete(store));}else{onComplete(store)}
export function getStore() {
return store;
}