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javascript - 对象作为 React-Child 无效 > 使用数组代替异常

问题描述

我最近开始学习 React-Native，我现在正在尝试创建一个授权应用程序。但是当我尝试创建一个登录表单组件时，我收到了一个错误，例如：“对象作为 React Child 无效......”

这是我完整的 .js 文件：

import React, {Component} from 'react';
import {View, TextInput} from 'react-native';
import Button from './common/Button';

class LoginForm extends Component {
  constructor(props) {
    super(props);
    this.state = {email: '', password: ''};
  }
  render() {
    const {containerStyle, subContainerStyle, inputStyle} = styles;
    return (
      <View style={containerStyle}>
        <View style={subContainerStyle}>
          <TextInput>
            placeholder="Email" style = {inputStyle}
            value = {this.state.email}
            onChangeText= {(email) => this.setState(email)}
          </TextInput>
        </View>
        <View style={subContainerStyle}>
          <TextInput>
            placeholder="Email" style = {inputStyle}
            value = {this.state.password}
            onChangeText= {(password) => this.setState(password)}
          </TextInput>
        </View>
        <View style={subContainerStyle}>
          <Button onPress={() => console.log('pressed')}>Login</Button>
        </View>
      </View>
    );
  }
}

const styles = {
  containerStyle: {
    borderWidth: 1,
    borderRadius: 2,
    borderColor: '#ddd',
    borderBottomWidth: 0,
    shadowColor: '#000',
    shadowOffset: {width: 0, height: 2},
    shadowOpacity: 0.1,
    shadowRadius: 2,
    elevation: 1,
    marginLeft: 5,
    marginRight: 5,
    marginTop: 10,
  },
  subContainerStyle: {
    borderBottomWidth: 1,
    padding: 5,
    backgroundColor: '#fff',
    justifyContent: 'flex-start',
    flexDirection: 'row',
    borderColor: '#ddd',
    position: 'relative',
  },
  inputStyle: {
    color: '#000',
    paddingRight: 5,
    paddingLeft: 5,
    fontSize: 18,
    lineHeight: 23,
    flex: 2,
  },
};

export default LoginForm;

我期望使用用户输入的电子邮件和密码创建一个基本的登录页面。但无法创建它。我还将我在顶部向您展示的这个表单组件导入到我的 App.js 中，就是这么简单。

标签： javascriptreactjsreact-nativereact-reduxcomponents

解决方案

您应该像这样更新渲染功能。

render() {
    const {containerStyle, subContainerStyle, inputStyle} = styles;
    return (
      <View style={containerStyle}>
        <View style={subContainerStyle}>
          <TextInput
            placeholder="Email"
            style = {inputStyle}
            value = {this.state.email}
            onChangeText= {(email) => this.setState({ email })}
          />
        </View>
        <View style={subContainerStyle}>
          <TextInput
            placeholder="Password"
            style = {inputStyle}
            value = {this.state.password}
            onChangeText= {(password) => this.setState({password})}
          />
        </View>
        <View style={subContainerStyle}>
          <Button onPress={() => console.log('pressed')}>Login</Button>
        </View>
      </View>
    );
  }

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