使用react-native与expo + redux + ex-navigation时出错

Question

index.js

import React, { Component } from 'react';
import { StatusBar } from 'react-native';
import { Provider, connect } from 'react-redux';
import { NavigationProvider, StackNavigation, NavigationContext } from '@expo/ex-navigation';
import Router from './routers';
import Store from './store/configureStore';

// Store & Router

const navigationContext = new NavigationContext({
  router: Router,
  store: Store,
})

export default class App extends Component {
  render() {
    return (
      <Provider store={Store}>
        <NavigationProvider context={navigationContext}>
          <StatusBar barStyle="light-content" />
          <StackNavigation initialRoute={Router.getRoute('about')} />
        </NavigationProvider>
      </Provider>
    );
  }
}

configureStore.js

import { createNavigationEnabledStore, NavigationReducer } from '@expo/ex-navigation';
import { combineReducers, createStore } from 'redux';

const createStoreWithNavigation = createNavigationEnabledStore({
  createStore,
  navigationStateKey: 'navigation',
});

const store = createStoreWithNavigation(
  combineReducers({
    navigation: NavigationReducer,
  })
);

export default store;

路由器/ index.js

import React from 'react';
import { createRouter } from '@expo/ex-navigation';

import About from './About';

export default createRouter(() => ({
  about: () => About,
}));

在android avd上运行上面的代码时，avd会抛出一个错误：

  

TypeError：undefined不是对象（评估'navigationState.navigators'）

下面的详细错误：

TypeError: undefined is not an object (evaluating 'navigationState.navigators')

This error is located at:
    in Connect(FocusableComponent(ExNavigationStack)) (at ExNavigationConnect.js:42)
    in ExNavConnect (at ExNavigationComponents.js:114)
    in ExNavigatorComponent(ExNavigatorComponent) (at index.js:23)
    in RCTView (at View.js:113)
    in View (at ExNavigationProvider.js:74)
    in ExNavigationProvider (at index.js:21)
    in Provider (at index.js:20)
    in App (at App.js:7)
    in App (created by AwakeInDevApp)
    in RCTView (at View.js:113)
    in View (created by AwakeInDevApp)
    in AwakeInDevApp (at registerRootComponent.js:34)
    in RootErrorBoundary (at registerRootComponent.js:33)
    in ExpoRootComponent (at renderApplication.js:35)
    in RCTView (at View.js:113)
    in View (at AppContainer.js:102)
    in RCTView (at View.js:113)
    in View (at AppContainer.js:122)
    in AppContainer (at renderApplication.js:34)
- node_modules/@expo/ex-navigation/src/ExNavigationComponents.js:33:20 in getStateForNavigatorId

运行时环境：

• Android模拟器Google Pixel XL

• sdk版本27

• react-native：0.50.3

• 反应：16.0.0

• @ expo / ex-navigation：4.2.0

• 世博会：23.0.6

如何解决上面的错误？

感谢