如何将导航道具从父组件传递到标头？

我有 4 个页面：App.js、HomeScreen.js、Login.js、Toolbar.js

我的应用程序页面与 StackNavigator：

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

import { StackNavigator, DrawerNavigator } from 'react-navigation';

import Splash from './screens/Splash';
import HomeScreen from './screens/HomeScreen';
import Login from './screens/Login';
import Lobby from './screens/Lobby';
import Wifi from './screens/Wifi';
import Toolbar from './components/ToolBar/Toolbar';
import Mobile from './screens/Mobile';


;

const Navigation = StackNavigator({
  Splash:{screen: Splash},
  HomeScreen:{screen: HomeScreen},
  Login:{screen: Login},
  Lobby:{screen: Lobby},
  Wifi:{screen: Wifi},
  Mobile:{screen:Mobile}
}, {
  mode: 'modal',
  headerMode: 'none'
});


export default Navigation;

我正在将工具栏导入到主屏幕，并希望将导航道具从主屏幕传递到工具栏，以便我可以从工具栏和主屏幕访问登录页面。

我的工具栏页面：

import React,{Component} from 'react';
import {Text, View, Button, StyleSheet, TouchableOpacity, 
    Dimensions,
    Image,ScrollView, Picker, FlatList} from 'react-native';
import { StackNavigator, DrawerNavigator } from 'react-navigation';
import config from '../../components/config/index';




class Toolbar extends Component{
    constructor(){
        super()
        this.state = {

        }
    }
    render(){
    //const {navigate} = this.props.navigation;
        return(
            <View style={styles.mainToolbar}>
                <View style={styles.containerForThree}>
                    <View style={styles.leftArrowContainer}>

                        <TouchableOpacity
                            onPress={()=>navigate('Login')}
                        >
                            <Text>hello</Text>

                        </TouchableOpacity>

                    </View>

截至目前，我已将 const navigation 注释掉，因为如果出现 HomeScreen，则不会加载它。

主屏幕：

import React,{Component} from 'react';
import {
    AppRegistry, StyleSheet, Text, View, Image, ScrollView, Button, TouchableOpacity, Dimensions
    } from 'react-native';
import { StackNavigator } from 'react-navigation';
import Toolbar from '../components/ToolBar/Toolbar';

export default class HomeScreen extends Component {
    static navigationOptions ={
        title: 'Home Screen'
    };


    onValueChange(value, idx){
        this.setState({
            language: value
        })

        AsyncStorage.setItem('language', value)   
    }

    render(){
        var {navigate} = this.props.navigation;
        return(
            <View style={styles.scrollContainer}>
            <Toolbar navigate={navigate}/>
                <View>
                    <Text>Welcome To the SEcond Page</Text>
                        <Button
                            onPress={
                                ()=>navigate("Login")
                            }
                            title="Go to Login"
                        />
                </View>

我尝试通过以下方式将导航道具从主屏幕传递到工具栏

当我按下按钮时，它说找不到变量“导航”。但是，当我取消注释工具栏上的导航时，我收到错误 TypeError: undefined is not an object(evaluating 'this.props.navigation.navigate')

这里你正在传递一个道具navigate to Toolbar: <Toolbar navigate={navigate}/>

因此您需要在中引用它render(): const { navigate } = this.props;

所以这只是一个小错误，但这就是修复它的方法。

我个人鼓励通过navigation to Toolbar: <Toolbar navigation={ this.props.navigation } />。因此，您可以更清楚地了解导航对象。