react native - 期望一个组件类，得到 [object Object]

Question

当我尝试使用我创建的 loginPage 组件时，我预计组件类会出现对象错误。

这里是 index.ios.js

import React, {Component} from 'react';

import {
    AppRegistry,
    View
} from 'react-native';

import loginPage from './pages/loginPage'

class app extends Component {
    render() {
        return (
            <View>
                <loginPage/>
            </View>
        );
    }
}

AppRegistry.registerComponent('app', () => app);

这里是 loginPage.js

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

export default class loginPage extends Component {
    render() {
        return (
            <View>
                <Text>
                    Welcome to React Native!
                </Text>
            </View>
        );
    }
}

Answer 1

您需要将loginPage 类重命名为LoginPage，该类必须大写

Answer 2

loginPage.js

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

const LoginPage = () => {
    return (
        <View>
                <Text>
                    Welcome to React Native!
                </Text>
            </View>
    );
}
export default LoginPage;

index.ios.js

import React, {Component} from 'react';

import {
    AppRegistry,
    View
} from 'react-native';

import LoginPage from './pages/loginPage'

class app extends Component {
    render() {
        return (
            <View>
                <LoginPage/>
            </View>
        );
    }
}

Answer 3

移除index.ios.js中的标签

import React, {Component} from 'react';

import {
    AppRegistry,
    View
} from 'react-native';

import loginPage from './pages/loginPage'

class app extends Component {
    render() {
        return (

                <loginPage/>

        );
    }
}

AppRegistry.registerComponent('app', () => app);