在类中存在的标题内使用“导航"和“路由"

本文介绍了在类中存在的标题内使用“导航"和“路由" - React-navigation v5的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我被卡住了，因为我想切换到 V5 版本的 react-navigation.在 v4 中，我曾经传递我的参数并将它们用于:

I'm stuck as I want to switch to the V5 version of react-navigation. With v4, I used to pass my params and use them with :

• 设置:

this.props.navigation.navigate('MyDestination', {myParam: 'value'})

• 获取:

this.props.navigation.getParam('myParam')

在 v5 中，有些事情发生了变化，我现在无法使用 this.props.navigation，因为应用似乎不知道它.

With v5, some things changed and I now can't use the this.props.navigation since it's not seemed to be known by the app.

我的代码被拆分了，所以我的 App.js 只引用了 Navigation 类:

My code is splitted so I have my App.js that only refer to the Navigation class :

import React from 'react'; import { StyleSheet, Text, View } from 'react-native' import Navigation from './navigation/Navigation' export default function App() { return ( <Navigation/> ); } const styles = StyleSheet.create({ container: { flex: 1, backgroundColor: '#fff', alignItems: 'center', justifyContent: 'center', }, });

然后我的导航文件包含所有导航机制(我还没有添加我的 TabBar，因为我想先修复基本导航):

Then my Navigation file contains all the navigation mechanism (I did not added my TabBar yet, since I want to fix the base navigation first) :

import { NavigationContainer } from '@react-navigation/native' import { createStackNavigator } from '@react-navigation/stack' import { createBottomTabNavigator } from 'react-navigation-tabs' import { StyleSheet, Image } from 'react-native' import React from 'react' import Home from '../components/Home' import LendList from '../components/LendList' import AddMoney from '../components/AddMoney' import AddStuff from '../components/AddStuff' import Settings from '../components/Settings' import Test from '../components/Test' function HomeScreen() { return( <Home/> ) } function LendListScreen() { return( <LendList/> ) } const Stack = createStackNavigator() function App() { return( <NavigationContainer> <Stack.Navigator initialRouteName="Home"> <Stack.Screen name="Home" component={Home} options={{ title: "Home Page"}} /> <Stack.Screen name="LendList" component={LendList} options={{ title: 'Liste' }} /> <Stack.Screen name="AddMoney" component={AddMoney} options={{ title: "Ajout Money"}} /> <Stack.Screen name="AddStuff" component={AddStuff} options={{ title: "Ajout Stuff"}} /> <Stack.Screen name="Settings" component={Settings} options={{ title: "Settings"}} /> <Stack.Screen name="Test" component={Test} options={{ title: "Test"}} /> </Stack.Navigator> </NavigationContainer> ) } export default App

然后是我的每个页面(用类编码)，这里有一个例子，Home.js(我删除了所有 Style 部分以缩短此处显示的代码):

And then come each of my pages (coded with classes), and here is one example, Home.js (I removed all the Style part to shorten the code displayed here) :

import React from 'react' import { StyleSheet, Text, Image, View, Button, TouchableOpacity } from 'react-native' import Moment from 'react-moment' import { CommonActions } from '@react-navigation/native' import { useNavigation } from '@react-navigation/native' class Home extends React.Component { static navigationOptions = () => { return { headerRight: () => <TouchableOpacity style={styles.settings_touchable_headerrightbutton} onPress={() => this.goToSettings()}> <Image style={styles.settings_image} source={require('../assets/ic_settings.png')} /> </TouchableOpacity> } } constructor(props) { super(props) this._goToSettings = this._goToSettings.bind(this) } _updateNavigationParams() { navigation.setParams({ goToSettings: this._goToSettings }) } componentDidMount(){ console.log("navigation") this._updateNavigationParams() } _checkMoneyDetails(navigation){ navigation.navigate('LendList', {type: 'Money'}) } _checkStuffDetails(navigation){ navigation.navigate('LendList', {type: 'Stuff'}) } _checkPeopleDetails(navigation){ navigation.navigate('LendList', {type: 'People'}) } _goToSettings = () => { navigation.navigate('Settings') } render(){ const date = new Date(); const { navigation } = this.props; return( <View style={styles.main_container}> <View style={styles.header_view}> <Text style={styles.header_text}>GiViToMe</Text> <Text style={styles.header_text}>Nous sommes le :{' '} {/* TODO: Penser à gérer ensuite les formats de date étrangers */} <Moment element={Text} format="DD/MM/YYYY" date={date}/> </Text> </View> <View style={styles.lend_view}> <Text style={styles.title_lend_text}>Vos prêts :</Text> <View style={styles.money_stuff_view}> <View style={styles.money_view}> <View style={styles.money_data_view}> <Image source={require('../assets/ic_money.png')} style={styles.home_img} /> <Text>XXX $</Text> </View> <Button title='Money' onPress={() => {this._checkMoneyDetails(navigation)}}/> </View> <View style={styles.stuff_view}> <View style={styles.stuff_data_view}> <Image source={require('../assets/ic_box.png')} style={styles.home_img} /> <Text>XXX objets</Text> </View> <Button title='Stuff' onPress={() => {this._checkStuffDetails(navigation)}}/> </View> </View> <View style={styles.people_view}> <View style={styles.people_data_view}> <Image source={require('../assets/ic_people.png')} style={styles.home_img} /> <Text>XXX people</Text> </View> <Button title='People' onPress={() => {this._checkPeopleDetails(navigation)}}/> </View> </View> <View style={styles.footer_view}> <Text style={styles.text_footer_view}>a.vescera inc.</Text> </View> </View> ) } } export default Home

我的问题是，根据在线文档，我看到要在类中使用导航"或路由"，我应该在render() 函数.

My problem is that, per the online documentation, I saw that to use "navigation" or "route" within a class, I should use the const navigation = { this.props } after the render() function.

这个问题是，要在标头中使用一个特定的函数，我必须在 componentDidMount() 函数之后绑定它，但是 render() 还不知道.

This problem is that, to use one specific function within the header, I have to bind it after the componentDidMount() function, but the value present under render() is not yet known.

我该如何解决这个问题?(确保在给定的示例中，导航部分中的所有代码允许轻松使用 navigation 和 route 但您知道我必须拆分我的代码.

How could I solve this ? (sure that in the given example, having all the code in the navigation part allow to use navigation and route easily but you understand that I have to split my code.

谢谢.

推荐答案

好的，所以每次都一样，我尝试了很多天解决我的问题，当我最终决定在堆栈上发布时，我找到了解决方案:).

Ok, so each time the same, I try many days solving my problem, and when I finally decide to post on stack, I find a solution :).

因此，如果您在查看我的代码时可能会发现一些性能问题或其他问题，请随时纠正我.我刚刚发现这个解决方案解决了我的问题.

So, if there's some performance issue or other you may see by looking at my code, do not hesitate to correct me. I just found that this solution solved my problem.

所以在我的 Navigation.js 文件中，我只是传递了导航和路由对象以使它们可用，这要归功于我的类中的道具，如下所示:

So within my Navigation.js file, I just passed the navigation and route objects to make them usable thanks to the props into my classes, like this :

function App() { return( <NavigationContainer> <Stack.Navigator initialRouteName="Home"> <Stack.Screen name="Home" component={Home} options={({route, navigation}) => ( {headerTitle: 'Home Page', route: {route}, navigation: {navigation}} )} /> </Stack.Navigator> </NavigatorContainer> )}

然后在我的课程中，我只需调用 this.props.navigation 或 this.props.route 并从这些对象中收集我需要的东西.

then within my classes I just call to this.props.navigation or this.props.route and gather form these objects what I need.

另一件事是，对于那些将使用此代码构建类似内容的人，我还必须更改显示标题按钮的方式.我不使用 static navigationOptions = () =>{} 了.我只是在 ComponentDidMount 函数中直接添加 navigation.setOptions 一段代码，如下所示:

Other thing is that, for those who would use this code to build something similar, I also had to change the way I display the header button. I do not use the static navigationOptions = () => {} anymore. I just add directly the navigation.setOptions piece of code within the ComponentDidMount function like this:

navigation.setOptions({ headerRight: () => <TouchableOpacity style={styles.settings_touchable_headerrightbutton} onPress={() => route.params.goToSettings()}> <Image style={styles.settings_image} source={require('../assets/ic_settings.png')} /> </TouchableOpacity> })

我必须这样做，因为我使用的是在我的类中声明的函数，所以我必须像这样在构造函数中绑定它 this._goToSettings = this._goToSettings.bind(this)，然后将其添加到 navigation.setParams 函数中.

I have to do it this way since I'm using a function declared in my class, so I have to bind it in the constructor like this this._goToSettings = this._goToSettings.bind(this) and then add it to the navigation.setParams function.