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[英]undefined is not an object (evaluating 'props.navigation.navigate') while implementing react native navigation
[英]React Native: undefined is not an object (evaluating 'props.navigation.navigate')
我正在学习 React Native 并尝试使用 Expo 运行此代码,它给了我异常错误:未定义不是对象(评估“props.navigation.navigate”),在 App.js 的第 17 行(在注释中标记) )
有两个文件:App.js 和 Untitled1.js
应用程序:
import { StyleSheet, Text, View, TextInput, TouchableOpacity } from 'react-native';
import 'react-native-gesture-handler';
import { NavigationContainer } from '@react-navigation/native';
function App(props) {
return (
<View style={styles.container}>
<Text style={styles.logo}>APPetito</Text>
<Text style={styles.loginText}>Welcome to our app!</Text>
<Text style={styles.loginText}>Choose what do you want to do</Text>
// [ THE FOLLOWING LINE CONTAINS THE ERROR ]
<TouchableOpacity onPress={() => props.navigation.navigate("Untitled1")} style={styles.loginBtn}>
<Text style={styles.loginText}>I eat food</Text>
</TouchableOpacity>
<TouchableOpacity style={styles.loginBtn}>
<Text style={styles.loginText}>I sell food</Text>
</TouchableOpacity>
</View>
);
}
// here there are the const styles
export default App;
无题.js
import * as React from 'react';
import React, { Component } from "react";
import { StyleSheet, View, Text } from "react-native";
import Icon from "react-native-vector-icons/Entypo";
import { NavigationContainer } from '@react-navigation/native';
function Untitled1(props) {
return (
<View style={styles.container}>
<Icon name="check" style={styles.icon}></Icon>
<Text style={styles.itWorks}>It works!</Text>
</View>
);
}
// here there are the const styles
export default Untitled1;
我能做些什么来解决问题?
我认为问题在于您没有首先创建堆栈导航器来在屏幕之间导航。 请参阅反应导航文档以在此处了解更多信息
根据文档,您必须实现堆栈导航器,例如:
import * as React from 'react';
import { NavigationContainer } from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';
function Home(props) {
return (
<View style={styles.container}>
<Text style={styles.logo}>APPetito</Text>
<Text style={styles.loginText}>Welcome to our app!</Text>
<Text style={styles.loginText}>Choose what do you want to do</Text>
<TouchableOpacity onPress={() => props.navigation.navigate("Untitled1")} style={styles.loginBtn}>
<Text style={styles.loginText}>I eat food</Text>
</TouchableOpacity>
<TouchableOpacity style={styles.loginBtn}>
<Text style={styles.loginText}>I sell food</Text>
</TouchableOpacity>
</View>
);
}
const Stack = createStackNavigator();
function App() {
return (
<NavigationContainer>
<Stack.Navigator>
<Stack.Screen name="Home" component={Home} />
<Stack.Screen name="Untitled1" component={Untitled1} />
</Stack.Navigator>
</NavigationContainer>
);
}
export default App;
我已经稍微更新了您的代码以帮助您理解这个概念。
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