无法从登录.js解析图像路径



我对暴露和本地反应完全陌生我正在尝试使用图像背景我使用它作为下面的代码,但我收到此错误"无法从"应用程序\组件\登录.js解析"./assets/back.jpg"我的图像已在项目的资源文件夹中而且当我尝试导入字体时,我收到同样的错误它是否需要在使用前导入某些东西或其他东西?我也尝试过不导入图像并将路径直接添加到源属性

登录.js

import React, { Component } from 'react';
import back from './assets/back.jpg';
import {
    StyleSheet,
    Text,
    View,
    TextInput,
    KeyboardAvoidingView,
    TouchableOpacity,
    AsyncStorage,
    Image,
    ImageBackground,
} from 'react-native';
import {createStackNavigator, createAppContainer} from 'react-navigation';
export default class Login extends React.Component {
    static navigationOptions = {
        header: null,
    };
    constructor(props) {
        super(props);
        this.state = {
            username:'',
            password:'',
        }
    }
    componentDidMount(){
        this._loadInitialState().done();
    }
    _loadInitialState = async () =>{
        var value = await AsyncStorage.getItem('user');
        if (value !=null){
            this.prop.navigation.navigate('Profile');
        }
    }
    render() {
        return (
            <ImageBackground source={back} style={styles.backImg}>
                <KeyboardAvoidingView behavior='padding' style={styles.wrapper}>
                <View style={styles.container}>
                <Image
                    style={styles.logo}
                    source={require('/MyFirst/assets/logo.png')}
                />
                <TextInput
                    style={styles.textInput} placeholder='Username'
                    onChangeText={(username) =>this.setState({username}) }
                    underlineColorAndroid = 'transparent'
                        />
                        <TextInput
                    style={styles.textInput} placeholder='Password'
                    onChangeText={(password) =>this.setState({password}) }
                    underlineColorAndroid = 'transparent'
                        />
                        <TouchableOpacity style={styles.btn}
                    onPress={this.login}>
                <Text style={styles.btnText}>Login</Text>
                    </TouchableOpacity>
                    </View>
                    </KeyboardAvoidingView>
            </ImageBackground>
        );
    }
}
const styles = StyleSheet.create({
    wrapper:{
        flex:1,
    },
    container:{
        flex:1,
        alignItems:'center',
        justifyContent:'center',
        backgroundColor:'#e5ffd3',
        paddingLeft:40,
        paddingRight:40,
    },
    logo:{
        width: 250,
        height: 250,
    },
    textInput:{
        alignSelf:'stretch',
        padding:16,
        marginBottom:20,
        backgroundColor:'#fff',
        borderWidth: 1,
        borderColor: '#d6d7da',
        borderRadius: 25,
    },
    btn:{
        alignSelf:'stretch',
        backgroundColor:'#589e25',
        padding:20,
        alignItems: 'center',
        borderRadius: 25,
    },
    btnText:{
        color: '#ffffff',
    },
})

应用.js

import React, { Component } from 'react';
import {
    StyleSheet,
    Text,
    View
} from 'react-native';
import {createStackNavigator, createAppContainer} from 'react-navigation';
import Login from './app/components/Login'
import Profile from './app/components/Profile'
const MainNavigator = createStackNavigator({
    Home: {screen: Login},
    Profile: {screen: Profile},
});
const App = createAppContainer(MainNavigator);
export default App;

你应该以这种方式使用ImageBackground。它将解决您的问题

 <ImageBackground source={require('../../assets/back.jpg')} style={styles.backImg}>

工作示例可以在这里找到

链接

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