Question

我是Android应用程序开发人员。我已经开始研究React-Native了。我无法找到一种方法来显示导航抽屉内的可扩展列表。如果可以使用此功能，建议使用库。

navigationOptions无法提供列表（请参阅下面的代码）。

我想展示像项目4 这样的可扩展视图
我的代码是： -

import {DrawerNavigator} from 'react-navigation';
import React, {Component} from 'react';
import {
  Platform,
  StyleSheet,
  Text,
  Image,
  View,
  TouchableHighlight
} from 'react-native';

import Screen1 from './screen/Screen1'
import Screen2 from './screen/Screen2'
const util = require('util');

class MyHomeScreen extends React.Component {

  constructor(props) {
    super(props);

    this.state = {
      headertitle: 'ffffff'
    };
  }

  componentWillReceiveProps(nextProps) {
    navigationOptions = {
      title: this.nextProps.headertitle
    };
  }

  static navigationOptions = {
    drawerLabel: 'Home',
    drawerIcon: ({tintColor}) => (
      <Image
      source={require('./images/document.png')}
      style={[
      styles.icon, {
        tintColor: tintColor
      }
    ]}/>),
    title: 'NIIT'
  };

  render() {

    return (<Screen1/>);
  }
}

class MyNotificationsScreen extends React.Component {
  static navigationOptions = {
    drawerLabel: 'Notifications',
    drawerIcon: ({tintColor}) => (<Image source={require('./images/smartphone.png')} style={[styles.icon]}/>),
    title: 'Gnome'
  };

  render() {
    return (<Screen2/>);
  }
}

const styles = StyleSheet.create({
  icon: {
    width: 24,
    height: 24
  }
});

const DrawerScreen = DrawerNavigator({
  Screen1: {
    screen: MyHomeScreen
  },
  Screen2: {
    screen: MyNotificationsScreen
  }
}, {headerMode: 'none'})

export default DrawerScreen;

Answer 1

react-navigation目前不支持抽屉导航器中的可折叠菜单。

但是，您可以通过向导航器提供自己的contentComponent来实现自己的：

const DrawerScreen = DrawerNavigator({
  Screen1: {
    screen: MyHomeScreen
  },
  Screen2: {
    screen: MyNotificationsScreen
  }
}, {
  headerMode: 'none',
  contentComponent: MyDrawer
})

const MyDrawer = (props) => ...

有关详细信息，请参阅the documentation。

您可以使用react-native-collapsible之类的内容来实现可折叠菜单本身的效果。

Answer 2

我认为这是OP所要求的单个类，简单的实现。它使用react-navigation v5。它是一个独立的组件，通过ExpandableDrawerProps配置（title是父抽屉的名称，即包含子抽屉且没有导航的内容，选择是标签名称到导航屏幕组件名称的映射。）它是用TypeScript编写的（这两个都是.tsx文件），因此，如果您不使用TypeScript，只需去除打字即可。

import {
  DrawerContentComponentProps,
  DrawerContentScrollView,
  DrawerItem,
} from '@react-navigation/drawer';
import React from 'react';
import { Text, View } from 'react-native';
import { TouchableOpacity } from 'react-native-gesture-handler';
import styles from './styles';

export type ExpandableDrawerProps = DrawerContentComponentProps & {
  title: string;
  choices: Map<string, string>;
};

export default class ExpandableDrawer extends React.Component<
  ExpandableDrawerProps,
  {
    isExpanded: boolean;
  }
> {
  constructor(props: ExpandableDrawerProps, state: { isExpanded: boolean }) {
    super(props);
    this.state = state;
  }

  onPress = (): void => {
    this.setState(() => {
      return {
        isExpanded: !this.state.isExpanded,
      };
    });
  };

  render = (): JSX.Element => {
    return (
      <View style={styles.container}>
        <TouchableOpacity
          activeOpacity={0.8}
          onPress={this.onPress}
          style={styles.heading}
        >
          <Text style={styles.expander}>{this.props.title}</Text>
        </TouchableOpacity>

        {this.state.isExpanded ? (
          <DrawerContentScrollView>
            <View style={styles.expandedItem}>
              {[...this.props.choices.keys()].map(
                (label: string): JSX.Element | null => {
                  const screen = this.props.choices.get(label);
                  if (screen != undefined) {
                    return (
                      <DrawerItem
                        key={label}
                        label={label}
                        onPress={(): void => {
                          this.props.navigation.navigate(screen);
                        }}
                      />
                    );
                  } else {
                    return null;
                  }
                }
              )}
            </View>
          </DrawerContentScrollView>
        ) : null}
      </View>
    );
  };
}

您可以将该代码拖放到文件中，制作一个简单的样式文件或从该代码中删除它们，然后就可以在常规抽屉式导航中使用<ExpandableDrawerMenu {...expandable} />。

这是我在普通导航抽屉中使用它的方式。

const DrawerContent = (props: DrawerContentComponentProps): JSX.Element => {
  const c = new Map<string, string>();
  c.set('SubItem 1', 'SubItem1');
  c.set('SubItem 2', 'SubItem2');
  const expandable: ExpandableDrawerProps = {
    title: 'Expandable Drawer',
    choices: c,
    navigation: props.navigation,
    state: props.state,
    descriptors: props.descriptors,
    progress: props.progress,
  };
  return (
    <DrawerContentScrollView {...props}>
      <View style={styles.drawerContent}>
        <Drawer.Section style={styles.drawerSection}>
          <DrawerItem
            label="Item 1"
            onPress={(): void => {
              props.navigation.navigate('Item1');
            }}
          />

          <ExpandableDrawerMenu {...expandable} />

          <DrawerItem>
            label="Item 2"
            onPress={(): void => {
              props.navigation.navigate('Item2');
            }}
          />
          <DrawerItem
            label="Item 3"
            onPress={(): void => {
              props.navigation.navigate('Item3');
            }}
          />
        </Drawer.Section>
      </View>
    </DrawerContentScrollView>
  );
};

export default class Navigator extends Component {
  render = (): JSX.Element => {
    const Drawer = createDrawerNavigator();

    return (
      <NavigationContainer>
        <Drawer.Navigator
          drawerContent={(props: DrawerContentComponentProps): JSX.Element =>
            DrawerContent(props)
          }
          initialRouteName="Item1"
        >
          <Drawer.Screen name="Item1" component={Item1Screen} />
          <Drawer.Screen name="SubItem1" component={SubItem1Screen} />
          <Drawer.Screen name="SubItem2" component={SubItem2Screen} />
          <Drawer.Screen name="Item2" component={Item2Screen} />
          <Drawer.Screen name="Item3" component={Item3Screen} />
        </Drawer.Navigator>
      </NavigationContainer>
    );
  };
}

Answer 3

我已经针对此问题开发了一种解决方案。我的代码使用
“ @ react-navigation / drawer”：“ ^ 5.1.1”和
“ @ react-navigation / native”：“ ^ 5.0.9”。

Gihub链接-https://github.com/gyanani-harish/ReactNative-ExpandableDrawerMenu

需要在导航抽屉内显示可扩展列表视图

3 个答案: