无法更改持久化的 redux 状态

Question

我正在使用 Redux Persist 来保存应用程序的状态，以便它在关闭和再次打开时是一样的。初始状态已成功保存，但我似乎无法通过操作更新持久状态。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/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;

调度减速器

import { strings } from "../../locales/i18n";
import * as types from "../actions/types";

const initialState = strings("schedule.list").map((item, index) => {
  return {
    key: index.toString(),
    title: item.title,
    time: item.time,
    location: item.location,
    description: item.description,
    isFavorite: false
  };
});

const scheduleReducer = (state = initialState, action) => {
  switch (action.type) {
    case types.TOGGLE_FAVORITE:
      state.map(schedule => {
        if (schedule.key === action.id) {
          return (schedule.isFavorite = !schedule.isFavorite);
        }
      });
      return state;
    default:
      return state;
  }
};

export default scheduleReducer;

我可以看到 isFavorite 的状态在我调用操作时发生了变化，但在我重新加载应用程序时它并没有持续存在。这可能是什么问题？

Answer 1

map总是用回调函数的结果创建一个新数组，看看here。在你的减速器中，你正在应用 map 函数，但你没有持有对新数组的任何引用并返回 existing state，因此 state 没有变化，你的状态是不被坚持。

您可以按如下方式更改您的减速器

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;
  }
};

希望这会有所帮助！

无法更改持久化的 redux 状态

Can't change persisted redux state

react-native

react-redux

redux-persist