React Native - 如何使用抽屜導航管理本機后退按鈕

Question

我按照以下代碼重新創建了抽屜導航： https ： //github.com/mariodev12/react-native-menu-drawer-navigator

一切正常，但現在我不知道如何處理本機按鈕返回..我想總是返回上一頁，但如果你在主頁退出應用程序按兩次。

這是我的代碼：

App.js

import React from 'react';
import {StackNavigator} from 'react-navigation';
import DrawerStack from './src/stacks/drawerStack';

const Navigator = StackNavigator({
    drawerStack: {screen: DrawerStack}
}, {
    headerMode: 'none',
    initialRouteName: 'drawerStack'
})

export default Navigator

drawerStack.js

import React from 'react'
import {StackNavigator, DrawerActions} from "react-navigation";
import {Text, View, TouchableOpacity} from 'react-native';
import Home from "../components/home";
import DrawerScreen from "./drawerScreen";

const DrawerNavigation = StackNavigator({
    DrawerStack: {screen: DrawerScreen}
}, {
    headerMode: 'float',
    navigationOptions: ({navigation}) => ({
        headerStyle: {
            backgroundColor: 'rgb(255,45,85)',
            paddingLeft: 10,
            paddingRight: 10
        },
        title: 'Home',
        headerTintColor: 'white',
        headerLeft: <View>
            <TouchableOpacity
                onPress={() => {
                    if (navigation.state.isDrawerOpen === false) {
                        navigation.dispatch(DrawerActions.openDrawer());
                    } else {
                        navigation.dispatch(DrawerActions.closeDrawer());
                    }
                }}>
                <Text>Menu</Text>
            </TouchableOpacity>
        </View>
    })
})

export default DrawerNavigation;

drawerScreen.js

import {DrawerNavigator} from 'react-navigation'
import Home from '../components/home';
import Login from '../components/login';
import Contacts from '../components/contacts';
import News from '../components/news';

const DrawerScreen = DrawerNavigator({
    Home: {screen: Home},
    Login: {screen: Login},
    Contacts: {screen: Contacts},
    News: {screen: News}
}, {
    headerMode: 'none',
    initialRouteName: 'Home'
})

export default DrawerScreen;

news.js“一頁示例”

import React from "react";
import {Text, View} from 'react-native';

export default class News extends React.Component {
    render() {

        return (
            <View>
                <Text> Here Leave the News!! </Text>
            </View>
        );
    }
}

現在，如何僅在“News.js”頁面中插入標題中的后退按鈕而不是經典菜單（DrawerStack）？

Answer 1

在Android中，您必須使用來自react-native的BackHandler自行處理后退按鈕操作。

首先

import { BackHandler } from 'react-native';

在ComponentDidMount中添加一個事件監聽器來監聽backpress：

componentDidMount() {
    BackHandler.addEventListener("hardwareBackPress", this.onBackPress);
}

在ComponentwillUnmount中確保刪除監聽器：

componentWillUnmount() {
    BackHandler.removeEventListener("hardwareBackPress", this.onBackPress);
}

然后

 onBackPress = () => {

     //inside here do what you want with single back button
 }

也可以訪問此鏈接： https ： //reactnavigation.org/docs/en/drawer-based-navigation.html

如果您想使用后退按鈕返回上一個屏幕抽屜導航不適合您，您應該嘗試使用Stack Navigator。

Answer 2

您也需要在新聞屏幕中創建按鈕，就像這樣。

import React from "react";
import {Text, View} from 'react-native';

export default class News extends React.Component {

    static navigationOptions = ({navigation}) => {
        return {
            headerLeft: --- PUT HERE YOU CUSTOM BUTTON (Use navigation.goBack() in onPress)
        }
    }

    render() {

        return (
            <View>
                <Text> Here Leave the News!! </Text>
            </View>
        );
    }
}

為了做得更好，您可以創建僅包含自定義導航選項的新屏幕。