如何解决“不变违规：此导航器缺少导航道具”？

Question

我刚刚将我的react-navigation版本从1..0.0-beta.11更新到最新的react-navigation版本3.现在，在我的项目中，我在HomeScreen.js中使用了createStackNavigator。这是以下代码 -

HomeScreen.js

import React from 'react';
import { StyleSheet, Text, View, AsyncStorage } from 'react-native';
import {
  createStackNavigator
} from "react-navigation";
import WelcomeScreen from './WelcomeScreen';
import LoginScreen from './components/LoginScreen';
import NoteMeHome from './components/NoteMeHome';
import HomeDrawer from './HomeDrawer/HomeDrawer';
import SettingsScreen from './components/SettingsScreen';

class HomeScreen extends React.Component {

  state = {
    getValue: null,
  }

  async componentDidMount() {
    const token = await AsyncStorage.getItem('token');
    this.setState({ getValue: token });

  }

  render() {
    console.log('#ZZZ:', this.state.getValue);

    if(this.state.getValue !== null) {
      return (
        <AppStackNavigator/>
      );
    } else {
      return (
        <AppStackNavigator2/>
      );
    }

  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});

const AppStackNavigator = createStackNavigator({
  LoginScreen: {screen:LoginScreen},
  HomeDrawer: {screen:HomeDrawer},
  WelcomeScreen: {screen:WelcomeScreen},
  NoteMeHome: {screen:NoteMeHome},
  SettingsScreen: {screen:SettingsScreen}

}, 

{
  initialRouteName: 'WelcomeScreen'

}

)

const AppStackNavigator2 = createStackNavigator({
  WelcomeScreen: {screen:WelcomeScreen},
  HomeDrawer: {screen:HomeDrawer
  },

  LoginScreen: {screen:LoginScreen},
  NoteMeHome: {screen:NoteMeHome},

  SettingsScreen: {screen:SettingsScreen}

},  
{
  initialRouteName: 'WelcomeScreen'

}

)
export default HomeScreen;

在进行此更新之前，我的代码运行完美。但更新后显示以下错误 -

这是package.json文件 -

{
  "main": "node_modules/expo/AppEntry.js",
  "scripts": {
    "start": "expo start",
    "android": "expo start --android",
    "ios": "expo start --ios",
    "eject": "expo eject"
  },
  "dependencies": {
    "expo": "^32.0.0",
    "native-base": "^2.12.1",
    "react": "16.5.0",
    "react-native": "https://github.com/expo/react-native/archive/sdk-32.0.0.tar.gz",
    "react-native-awesome-alerts": "^1.2.0",
    "react-native-cardview": "^2.0.2",
    "react-navigation": "^3.6.1"
  },
  "devDependencies": {
    "babel-preset-expo": "^5.0.0"
  },
  "private": true
}

所以，如果有人帮我解决这个问题，那将是非常好的

Answer 1

只需在您的问题中添加此代码。您必须将您的堆栈包装在createAppContainer中。

import { createAppContainer } from 'react-navigation'



const AppStackNavigator = createAppContainer(createStackNavigator({
  LoginScreen: {screen:LoginScreen},
  HomeDrawer: {screen:HomeDrawer},
  WelcomeScreen: {screen:WelcomeScreen},
  NoteMeHome: {screen:NoteMeHome},
  SettingsScreen: {screen:SettingsScreen}

}, 
{
  initialRouteName: 'WelcomeScreen'

}
))


const AppStackNavigator2 = createAppContainer(createStackNavigator({
  WelcomeScreen: {screen:WelcomeScreen},
  HomeDrawer: {screen:HomeDrawer
  },

  LoginScreen: {screen:LoginScreen},
  NoteMeHome: {screen:NoteMeHome},

  SettingsScreen: {screen:SettingsScreen}

},  
{
  initialRouteName: 'WelcomeScreen'

}
))

Answer 2

在react-navigation v3中，你必须用makeRootNavigator包装createAppContainer。

将您的代码更改为：

render() {
   const Navigator = createAppContainer(makeRootNavigator(this.state.accessToken));
   return <Navigator />
}

并且不要忘记在文件顶部导入createAppContainer

import {createSwitchNavigator, createAppContainer} from 'react-navigation'