React Native Redux Reducer不工作

Question

我正在尝试将redux实现到一个相对简单的应用程序中，但是我的操作似乎没有正确地触发reducer。通过控制台日志记录，操作似乎正在启动，但相应的reducer没有被执行。

app.js：

import {Provider} from 'react-redux';
import configureStore from './src/config/configureStore.js';
const store = configureStore();

export default class App extends React.Component {    
render() {
return (
  <Provider store = {store}>
      <RootStack />
  </Provider>
);
}
}

import {createStore, applyMiddleware} from 'redux';
import reducers from '../reducers';
import thunk from 'redux-thunk';

export default function configureStore(initialState) {
  const store = createStore (
    reducers,
    applyMiddleware(thunk)
  );
  return store;
}

export const saveRisk = (payload) => {
  console.log('saved RISK!');
  return (dispatch) => {
    dispatch({type: 'risk_chosen',payload: payload});
  }
}

reducers/index.js：

import { combineReducers } from 'redux';
import RiskReducer from './RiskReducer';

export default combineReducers({
  risk_level: RiskReducer
});

riskreducer.js

const INITIAL_STATE = {risk_level: false};
export default (risk = INITIAL_STATE, action) => {
  if(action.type === 'risk_chosen') {
    console.log('RISK REDUCER SUCCESSFUL')
    return {
      ...risk, risk_level: action.payload
    };
  }
  console.log('REDUCER RISK:');
  console.log(risk);
  return risk;
}

js（RootStack中使用redux的子组件）：

import { connect } from 'react-redux';
import {saveRisk} from '../../actions'
@connect(state => ({risk_level: state.risk_level.risk_level}, {saveRisk}))
export default class RiskTolerance extends React.Component {
 //   ...
  componentDidMount(){
    console.log(this.props.risk_level);
 // ^^returns undefined, despite the reducer initializing it to "false"
    let riskVal = 'something'
    this.props.saveRisk(riskVal)
  }
 //   ...
}

编辑：我已经将reducer中的初始值更改为一个适当的对象，但是在调用该操作之后，我的reducer仍然不工作。有什么想法吗？谢谢你！

Answer 1

减速机的初始状态有问题。按如下所示进行更改：

INITIAL_STATE = { risk_level: false }