Javascript 如何使用导航v5+在抽屉导航器中嵌套堆栈导航器;
我的项目结构类似于:Javascript 如何使用导航v5+在抽屉导航器中嵌套堆栈导航器;,javascript,react-native,react-navigation,Javascript,React Native,React Navigation,我的项目结构类似于: app.js(加载数据和抽屉导航器) 主屏幕(在预览模式下使用之前获取的数据加载卡,当您单击时,您有一个获取该记录完整数据的NewsComponent) 新闻屏幕(使用之前获取的数据加载完整文章) 在我的App.js中,我使用的抽屉导航器如下: return ( <NavigationContainer> <Drawer.Navigator initialRouteName="Main">
- app.js(加载数据和抽屉导航器)
- 主屏幕(在预览模式下使用之前获取的数据加载卡,当您单击时,您有一个获取该记录完整数据的NewsComponent)
- 新闻屏幕(使用之前获取的数据加载完整文章)
return (
<NavigationContainer>
<Drawer.Navigator initialRouteName="Main">
<Drawer.Screen name="Main" options={{ headerShown: false}}>
{props => <MainScreen {...props} extraData={App.news} />}
</Drawer.Screen>
<Drawer.Screen name="Court Reservation" component={CourtReservation}></Drawer.Screen>
<Drawer.Screen name="News" component={NewsScreen}></Drawer.Screen>
</Drawer.Navigator>
</NavigationContainer>
);
}
返回(
{props=>}
);
}
但是我需要在主组件中插入一个堆栈导航器,以便显示记录(新闻屏幕),因为如果不是这样,当我返回到列表(主)并再次返回到另一个记录时,内容不会更新,并且会显示第一条记录
我试了好几次,但都出错了。现在我的主屏幕是这样的:
render() {
return (
<Container>
<Header>
<Left>
<Button onPress={() => this.props.navigation.openDrawer()} transparent>
<Icon name='menu' />
</Button>
</Left>
<Body>
<Title>Header</Title>
</Body>
<Right />
</Header>
<FlatList
data={this.state.news}
onEndReached={this.fetchMoreNews}
onEndReachedThreshold={0.5}
keyExtractor={(item, index) => index.toString()}
renderItem={({item}) => (
<Content>
<CardNewsComponent data={item} nav={this.props.navigation}/>
</Content>
)}/>
</Container>
);
}
render(){
返回(
this.props.navigation.openDrawer()}透明>
标题
index.toString()}
renderItem={({item})=>(
)}/>
);
}
但是正在使用抽屉导航ir命令“导航”到组件
如何集成堆栈导航器来实现这一点
编辑: 之后,我的app.js如下所示:
import * as React from 'react';
import { NavigationContainer } from '@react-navigation/native';
import { createDrawerNavigator } from '@react-navigation/drawer';
import { createStackNavigator } from '@react-navigation/stack';
import MainScreen from './screens/MainScreen';
import NewsScreen from './screens/NewsScreen';
import CourtReservation from './screens/CourtReservation';
import * as SplashScreen from 'expo-splash-screen';
import * as Font from 'expo-font';
import { Ionicons } from '@expo/vector-icons';
import axios from 'axios';
const Drawer = createDrawerNavigator();
const Stack = createStackNavigator();
const myStack = (<Stack.Navigator initialRouteName="Main">
<Stack.Screen name="Main" options={{ headerShown: false}}>
{props => <MainScreen {...props} extraData={App.news} />}
</Stack.Screen>
<Stack.Screen name="News" component={NewsScreen}></Stack.Screen>
</Stack.Navigator>)
export default class App extends React.Component {
state = {
appIsReady: false,
};
news = {};
async componentDidMount() {
// Prevent native splash screen from autohiding
try {
await SplashScreen.preventAutoHideAsync();
} catch (e) {
console.warn(e);
}
this.prepareResources();
}
/**
* Method that serves to load resources and make API calls
*/
prepareResources = async () => {
await performAPICalls();
await downloadAssets();
this.setState({ appIsReady: true }, async () => {
await SplashScreen.hideAsync();
});
};
render() {
if (!this.state.appIsReady) {
return null;
}
return (
<NavigationContainer>
<Drawer.Navigator initialRouteName="Main">
<Drawer.Screen name="Main" component={myStack}></Drawer.Screen>
<Drawer.Screen name="Court Reservation" component={CourtReservation}></Drawer.Screen>
</Drawer.Navigator>
</NavigationContainer>
);
}
}
// Put any code you need to prepare your app in these functions
async function performAPICalls() {
await axios.get('https://alqueriadelbasket.com/?r=noticias/FetchNoticiasJson&boundBot=0&boundTop=5')
.then((response) => {
App.news = response.data;
}).catch((error)=> {
console.log(error);
})
}
async function downloadAssets() {
await Font.loadAsync({
Roboto: require('native-base/Fonts/Roboto.ttf'),
Roboto_medium: require('native-base/Fonts/Roboto_medium.ttf'),
...Ionicons.font,
});
}
import*as React from'React';
从'@react-navigation/native'导入{NavigationContainer};
从'@react导航/drawer'导入{createDrawerNavigator};
从'@react navigation/stack'导入{createStackNavigator};
从“/screens/MainScreen”导入主屏幕;
从“./screens/newscreen”导入新闻屏幕;
从“/screens/CourtReservation”导入法庭预订;
从“世博会闪屏”导入*作为闪屏;
从“expo字体”导入*作为字体;
从“@expo/vector icons”导入{Ionicons};
从“axios”导入axios;
const Drawer=createDrawerNavigator();
const Stack=createStackNavigator();
常量myStack=(
{props=>}
)
导出默认类App扩展React.Component{
状态={
appIsReady:false,
};
新闻={};
异步组件didmount(){
//防止本机启动屏幕自动隐藏
试一试{
等待SplashScreen.preventAutoHideAsync();
}捕获(e){
控制台。警告(e);
}
这是prepareResources();
}
/**
*方法,该方法用于加载资源和进行API调用
*/
prepareResources=async()=>{
等待调用();
等待下载资产();
this.setState({appIsReady:true},async()=>{
等待SplashScreen.hideAsync();
});
};
render(){
如果(!this.state.appIsReady){
返回null;
}
返回(
);
}
}
//在这些函数中输入准备应用程序所需的任何代码
异步函数调用(){
等待axios。获取更多信息https://alqueriadelbasket.com/?r=noticias/FetchNoticiasJson&boundBot=0&boundTop=5')
。然后((响应)=>{
App.news=response.data;
}).catch((错误)=>{
console.log(错误);
})
}
异步函数下载资产(){
等待Font.loadAsync({
Roboto:require('native-base/font/Roboto.ttf'),
Roboto_medium:require('native-base/font/Roboto_medium.ttf'),
…Ionicons.font,
});
}
还有我的主屏幕
import React, { Component } from 'react';
import { Container, Content, Header, Left, Button, Icon, Right, Body, Title} from 'native-base';
import {FlatList} from 'react-native';
import CardNewsComponent from './components/CardNewsComponent';
import axios from 'axios';
export default class MainScreen extends Component {
constructor(props){
super(props);
this.state = {
news: this.props.extraData,
boundBot: 6,
bountTop: 11,
error: null,
};
}
fetchMoreNews = () => {
axios.get(`https://alqueriadelbasket.com/?r=noticias/FetchNoticiasJson&boundBot=${this.state.boundBot}&boundTop=${this.state.bountTop}`)
.then((response) => {
this.setState({
boundBot: this.state.boundBot+5,
boundTop: this.state.boundTop+5,
news: this.state.news.concat(response.data)
})
}).catch((error)=> {
console.log(error);
})
}
newsData = this.props.extraData;
render() {
return (
<Container>
<Header>
<Left>
<Button onPress={() => this.props.navigation.openDrawer()} transparent>
<Icon name='menu' />
</Button>
</Left>
<Body>
<Title>Header</Title>
</Body>
<Right />
</Header>
<FlatList
data={this.state.news}
onEndReached={this.fetchMoreNews}
onEndReachedThreshold={0.5}
keyExtractor={(item, index) => index.toString()}
renderItem={({item}) => (
<Content>
<CardNewsComponent data={item} nav={this.props.navigation}/>
</Content>
)}/>
</Container>
);
}
}
import React,{Component}来自'React';
从“本机基础”导入{容器、内容、标题、左侧、按钮、图标、右侧、正文、标题};
从“react native”导入{FlatList};
从“./components/CardNewsComponent”导入CardNewsComponent;
从“axios”导入axios;
导出默认类主屏幕扩展组件{
建造师(道具){
超级(道具);
此.state={
新闻:this.props.extraData,
六,,
汤顶:11,,
错误:null,
};
}
fetchMoreNews=()=>{
axios.get(`https://alqueriadelbasket.com/?r=noticias/FetchNoticiasJson&boundBot=${this.state.boundBot}&boundTop=${this.state.boundTop}`)
。然后((响应)=>{
这是我的国家({
boundBot:this.state.boundBot+5,
boundTop:this.state.boundTop+5,
新闻:this.state.news.concat(response.data)
})
}).catch((错误)=>{
console.log(错误);
})
}
newsData=this.props.extraData;
render(){
返回(
this.props.navigation.openDrawer()}透明>
标题
index.toString()}
renderItem={({item})=>(
)}/>
);
}
}
错误是“为屏幕主屏幕的'component'属性获取了无效值,它必须是有效的react组件。”
有趣的是,梅因以前工作得很有魅力…:/
编辑2: 试着看一下官方文件的内部 这就是问题所在: 它不可能是常量,它必须是一个函数…所以我将把这个函数添加到抽屉导航中,它就像一个符咒一样工作 代码如下:
function MyStack() {
return (
<Stack.Navigator initialRouteName="Main">
<Stack.Screen name="Main" options={{ headerShown: false}}>
{props => <MainScreen {...props} extraData={App.news} />}
</Stack.Screen>
<Stack.Screen name="News" component={NewsScreen}></Stack.Screen>
</Stack.Navigator>
);
}
函数MyStack(){
返回(
{props=>}
);
}
在抽屉导航器中,我们有抽屉屏幕
......
//您可以在此处添加堆栈导航器作为屏幕
因此,您可以在上面定义堆栈导航器,如下所示:
const MyStack=
//您的堆栈屏幕
......
然后,将其用作抽屉屏幕:
使用我正在进行的编辑“Undefined”不是一个对象(评估“Stack.Navigator”任何g