Getting undefined is not an object evaluating _thi

2020-02-09 00:41发布

I'm using DrawerNavigator and I have 3 pages: Router page, mainScreen and a photos page,
I maked a header navbar area and I used This <TouchableHighlight onPress={() => this.props.navigation.navigate('DrawerOpen')}> to open Drawer menu in mainScreen and used that for photos page too, menu is ok in mainScreen, But when I click <TouchableHighlight onPress={() => this.props.navigation.navigate('DrawerOpen')}> in photos page, I got this error: Photo
How Can I fix That?

My photos page:

import React from 'react';
import { Button, ScrollView, View, Text, StyleSheet, TouchableHighlight } from 'react-native';
import { DrawerNavigator } from 'react-navigation';
import MaterialIcons from 'react-native-vector-icons/MaterialIcons';
import Icon from 'react-native-vector-icons/FontAwesome'

const MyNavScreen = ({ navigation }) => (
  <View>
    <View style={styles.containerNavbar}>
      <TouchableHighlight onPress={() => this.props.navigation.navigate('DrawerOpen')}>
        <Icon name="bars" size={30} color="#fff" />
      </TouchableHighlight>
      <Text style={styles.navbarTitle}>Photos</Text>
    </View>

    <ScrollView>
      <View><Text>photo</Text></View>
      <Button onPress={() => navigation.goBack(null)} title="Go back" />
    </ScrollView>
  </View>
);

const MyPhotosHomeScreen = ({ navigation }) => (
  <MyNavScreen navigation={navigation} />
);
MyPhotosHomeScreen.navigationOptions = {
  title: 'Photos',
  drawerIcon: ({ tintColor }) => (
    <MaterialIcons
      name="photo"
      size={24}
      style={{ color: tintColor }}
    />
  ),
};
export default MyPhotosHomeScreen;

mainScreen:

export default class MainScreen extends React.Component {
    static navigationOptions = {
        drawerLabel: 'Home',
        drawerIcon: ({ tintColor }) => (
            <MaterialIcons
                name="home"
                size={24}
                style={{ color: tintColor }}
            />
        )
    };

    render() {
        return (
            <View>
                <View style={styles.containerNavbar}>
                    <TouchableHighlight onPress={() => this.props.navigation.navigate('DrawerOpen')}>
                        <Icon name="bars" size={30} color="#fff" />
                    </TouchableHighlight>
                    <Text style={styles.navbarTitle}>mainScreen</Text>
                </View>

                <View>
                    <View style={styles.containerFooter}>
                        <Text style={styles.footerTitle}>Footer</Text>
                    </View>
                </View>
            </View>

        )
    }
}

12条回答
聊天终结者
2楼-- · 2020-02-09 01:21

This is how I have done it in React Navigation 2 release: I call the openDrawer() method from a StackNavigator that is a child navigator of the DrawerNavigator.

This is my DrawerNavigator:

export const Drawer = DrawerNavigator(
    {
        MyAccount: {screen: TabsStack},
    });


export const TabsStack = StackNavigator({

    Tabs: {
        screen: Tabs, navigationOptions: ({navigation}) => ({
            headerLeft: (
                <TouchableOpacity style={{marginLeft: 10, marginTop: 3}}
                                  onPress={() => navigation.openDrawer()}>
                    <Image source={require('./assets/menu_h.png')}/>
                </TouchableOpacity>)
        })
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不美不萌又怎样
3楼-- · 2020-02-09 01:23

when you defined screen in createStackNavigator , it by default pass a props called navigation, something like this => navigation={this.props.navigation}

but when you using this.props.navigation.navigator("YOUR SCREEN ") and didn't defined this screen at createStackNavigator you must pass the navigation={this.props.navigation} form the screen that you defined in createStackNavigator and then you can use it in your component .

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forever°为你锁心
4楼-- · 2020-02-09 01:23

class ProductScreen extends Component {

export default ProductScreen; // make sure bottom this line mention

Call this

  <TouchableOpacity
        onPress = {() => this.props.navigation.navigate('ProductAddScreen')}
        activeOpacity={0.7} style={styles.button}>

       <Text style={styles.message}>{this.state.notFound} </Text>

  </TouchableOpacity>
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Summer. ? 凉城
5楼-- · 2020-02-09 01:26

I encountered the same problem. That's how I solved it:

  1. Verify that all your constructors have "props" has argument
  2. Bind the function with use the function this.props.navigation.navigate in the constructor like this: this.your_function = this.your_function.bind(this)
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混吃等死
6楼-- · 2020-02-09 01:27

If you are using navigation in child component don't forget to send navigation in props to child

    <ChildComponent navigation={this.props.navigation}/>

Access in child component like this

    props.navigation.navigate("ScreenName")
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倾城 Initia
7楼-- · 2020-02-09 01:29

If you use TouchableOpacity/Height in your child element, pass it this.props.onPress like this:

<TouchableOpacity onPress={this.props.onPress}/>

Then call the onPress function in your parent component like this:

<Parent onPress={this.Handlepress} />
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