React native Can';t改变持续重复状态
我正在使用Redux Persist保存应用程序的状态,以便在关闭和再次打开时保持相同。初始状态已成功保存,但我似乎无法使用操作更新持久状态。我的代码如下: App.jsReact native Can';t改变持续重复状态,react-native,react-redux,redux-persist,React Native,React Redux,Redux Persist,我正在使用Redux Persist保存应用程序的状态,以便在关闭和再次打开时保持相同。初始状态已成功保存,但我似乎无法使用操作更新持久状态。我的代码如下: App.js import React from "react"; import { createStore } from "redux"; import { persistStore, persistReducer } from "redux-persist"; import storage from "redux-persist/lib
import React from "react";
import { createStore } from "redux";
import { persistStore, persistReducer } from "redux-persist";
import storage from "redux-persist/lib/storage";
import reducers from "./src/reducers";
import { Provider } from "react-redux";
import { PersistGate } from "redux-persist/integration/react";
import Router from "./src/Router";
const persistConfig = {
key: "root",
storage,
debug: true
};
const persistedReducer = persistReducer(persistConfig, reducers);
const store = createStore(persistedReducer);
const persistor = persistStore(store);
const App = () => (
<Provider store={store}>
<PersistGate loading={null} persistor={persistor}>
<Router />
</PersistGate>
</Provider>
);
export default App;
我可以看到,调用操作时,
isFavorite
的状态会发生变化,但当我重新加载应用程序时,它不会持久化。这里会出现什么问题?map
始终使用回调函数的结果创建一个新数组,请查看。在reducer中,您正在应用映射
函数,但是您没有保留对新数组的任何引用,也没有返回现有状态
,因此状态没有变化
,并且您的状态没有被持久化
您可以按如下方式更换减速器
const scheduleReducer = (state = initialState, action) => {
switch (action.type) {
case types.TOGGLE_FAVORITE:
cont updatedState = state.map(schedule => {
if (schedule.key === action.id) {
return {
...schedule,
isFavorite: !schedule.isFavorite
};
}
return schedule;
});
return updatedState;
default:
return state;
}
};
希望这会有帮助 你永远不应该改变国家。如果需要更新状态,请创建一个副本,对其进行更新并返回新状态。最可能的情况是,redux persist无法识别状态已更改。以下是如何更新redux状态的常见模式。其中之一是“更新数组中的项”
const scheduleReducer = (state = initialState, action) => {
switch (action.type) {
case types.TOGGLE_FAVORITE:
cont updatedState = state.map(schedule => {
if (schedule.key === action.id) {
return {
...schedule,
isFavorite: !schedule.isFavorite
};
}
return schedule;
});
return updatedState;
default:
return state;
}
};