如何将导航道具从父组件传递到标头?

时间:2018-01-11 09:33:54

标签: react-native stack-navigator

我有4页:App.js,HomeScreen.js,Login.js,Toolbar.js

使用StackNavigator的我的应用页面:

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HomeScreen,并希望将导航道具从HomeScreen传递到工具栏,以便我可以从工具栏和HomeScreen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导航注释掉,因为如果出现HomeScreen,它将不会加载。

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>

我试图通过导航道具从HomeScreen传递到工具栏

当我按下按钮时,它说找不到变量'导航'。但是,当我取消注释导航工具栏时,我得到错误TypeError:undefined不是一个对象(evaulating'his.props.navigation.navigate')

3 个答案:

答案 0 :(得分:4)

在此您将道具navigate传递给Toolbar<Toolbar navigate={navigate}/>

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

所以这只是一个小错误,但那是什么解决了它。

我个人鼓励将navigation传递给Toolbar<Toolbar navigation={ this.props.navigation } />。因此,您可以更好地了解导航对象。

答案 1 :(得分:2)

您可以与React导航的Navigation道具一起使用。如果要从组件导航。 https://reactnavigation.org/docs/en/connecting-navigation-prop.html

答案 2 :(得分:1)

这是将withNavigation HOC包装到相应的组件中。这不像向孩子发送道具