反应原生:无法添加没有 YogaNode 或父节点的子节点 [英] React native: Cannot add a child that doesn't have a YogaNode or parent node

问题描述

刚开始学习 react-native，

Just started learning react-native,

我创建了一个单独的文件 flexdemo.js 并创建了如下组件:

I have created one separate file flexdemo.js and created component as below:

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

export default class FlexibleViews extends Component {
    render() {
        return (
            <View style={{ flex: 1 }}>
                <View style={{ flex: 1, backgroundColor: "powderblue" }}> </View>
                <View style={{ flex: 2, backgroundColor: "skyblue" }}> </View>
                <View style={{ flex: 3, backgroundColor: "steelblue" }}> </View>
            </View>

        );
    }
}

和App.js文件如下:

and App.js file is as below:

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

// import Bananas from './src/banana';
// import LotsOfStyles from './src/styledemo'

import FlexibleViews from './src/flexdemo';

export default class App extends Component {
  render() {
    return (
      // <Bananas name = "Tapan"/>
      <View>
        <FlexibleViews />
      </View>

    );
  }
}

这给了我这个错误:

现在，如果我尝试通过将 flexdemo.js 代码添加到 App.js 中来运行代码，那么一切正常.

像这样改变App.js:

Changed The App.js like this:

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

export default class FlexDimensionsBasics extends Component {
  render() {
    return (
      // Try removing the `flex: 1` on the parent View.
      // The parent will not have dimensions, so the children can't expand.
      // What if you add `height: 300` instead of `flex: 1`?
      <View style={{flex: 1}}>
        <View style={{flex: 1, backgroundColor: 'powderblue'}} />
        <View style={{flex: 2, backgroundColor: 'skyblue'}} />
        <View style={{flex: 3, backgroundColor: 'steelblue'}} />
      </View>
    );
  }
}

推荐答案

移除组件内的注释.

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