javascript - 如何在 native react 中添加抽屉？

Question

你好，我有一个简单的应用程序，我想给他添加一个抽屉，我使用react-navigation 4x并使用react-navigation-drawer在我的应用程序中实现抽屉我在单独的抽屉中使用它之前在一个包装中，效果很好但是当我使用新包时出现此错误

Invariant Violation: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

虽然我导出了我的屏幕

这是代码

**navigator.js**

    import React from 'react';
    import {TouchableOpacity, View} from 'react-native';
    import Icon from 'react-native-vector-icons';
    import {createAppContainer, createSwitchNavigator} from 'react-navigation';
    import {
      createDrawerNavigator,
      NavigationDrawerStructure,
    } from 'react-navigation-drawer';
    import {createStackNavigator} from 'react-navigation-stack';
    import ForgetPassword from '../screens/ForgetPassword';
    import Home from '../screens/Home';
    import Splash from '../screens/Splash';

    const AuthStackNavigator = createStackNavigator({
      Authloading: {
        screen: Splash,
        navigationOptions: {
          header: null,
        },
      },
    });

    const HomeStack = createStackNavigator({
      HomeScreen: {
        screen: Home,
        navigationOptions: ({navigation}) => ({
          title: 'Home',
          headerLeft: <NavigationDrawerStructure navigationProps={navigation} />,
          headerRight: (
            <TouchableOpacity
              onPress={() => navigation.navigate('Notifications')}
              style={{margin: 10}}>
              <Icon name="ios-notifications" size={28} color="#1DA1F2" />
            </TouchableOpacity>
          ),
        }),
      },
    });

    const DrawerNavigator = createDrawerNavigator({
      HomeDrawer: {
        screen: HomeStack,
        navigationOptions: {
          drawerLabel: 'Home',
          drawerIcon: () => <Icon name="ios-home" size={28} color="#0496FF" />,
        },
      },
    });

    const Navigations = createSwitchNavigator({
      // Authloading: Splash,
      Auth: AuthStackNavigator, // the Auth stack
      App: DrawerNavigator, // the App stack,
    });

    const Navigator = createAppContainer(Navigations);

    export default Navigator;


**Home.js**

    //import liraries
    import React, {Component} from 'react';
    import {StyleSheet, Text, View} from 'react-native';

    // create a component
    class Home extends Component {
      render() {
        return (
          <View style={styles.container}>
            <Text>Home</Text>
          </View>
        );
      }
    }


    //make this component available to the app
    export default Home;


**App.js**

    import React, {Component} from 'react';
    import Navigator from './src/navigations/navigator';
    class App extends Component {
      render() {
        return <Navigator />;
      }
    }

    export default App;

编辑

我只是认为 NavigationDrawerStructure 它是从react-native-drawer导出的，所以这是我的错:)

所以这里的组件名称为 NavigationDrawerStructure

//Navigation Drawer Structure for all screen
class NavigationDrawerStructure extends Component {
  //Structure for the navigatin Drawer
  toggleDrawer = () => {
    //Props to open/close the drawer
    this.props.navigationProps.toggleDrawer();
  };
  render() {
    return (
      <View style={{flexDirection: 'row'}}>
        <TouchableOpacity onPress={this.toggleDrawer}>
          <Icon
            name="ios-menu"
            size={40}
            style={{margin: 10}}
            color="#1DA1F2"
          />
        </TouchableOpacity>
      </View>
    );
  }
}

或者只需在主堆栈左侧添加一个切换按钮，如下所示

navigationOptions: ({navigation}) => ({
      title: 'Home',
      headerLeft: (
        <TouchableOpacity onPress={() => navigation.toggleDrawer()}>
          <Icon
            name="ios-menu"
            size={40}
            style={{margin: 10}}
            color="#1DA1F2"
          />
        </TouchableOpacity>
      )
})

Answer 1

导入无效。 react-navigation-drawer

中没有这些对象

import { createDrawerNavigator } from 'react-navigation-drawer';
import NavigationDrawerStructure from 'your file path'

相反

import {
      createDrawerNavigator,
      NavigationDrawerStructure,
    } from 'react-navigation-drawer';