1-4 项目底部导航菜单开发

http://127.0.0.1:8081/index.delta?platform=android&dev=true&minify=false

http://127.0.0.1:8081/index.delta?platform=android&dev=true&minify=false%20HTTP/1.1

JSX是React Native的语法，

https://github.com/ptomasroos/react-native-tab-navigator

单纯的install命令它只会将咱们这个组件react-native-tab-navigator安装到npm包里面、npm目录下，也就是说它不会将安装好的第三方组件添加到package.json里面去，所以如果咱们想将安装好的第三方组件也添加到package.json里面去呢，咱们需要加上刚刚--save这个参数。

npm已经帮我们添加了"react-native-tab-navigator": "^0.3.4"。

C:\Users\ZHONGZHENHUA\FirstApp\android\res\images\ic_polular.png

res/images/ic_polular.png

C:\Users\ZHONGZHENHUA\FirstApp\index.js

index.js

C:\Users\ZHONGZHENHUA\FirstApp\index.js

/** @format */
import React,{ Component } from 'react';
import {AppRegistry,StyleSheet,Image,Text,View} from 'react-native';
import App from './App';
import {name as appName} from './app.json';
import TabNavigator from 'react-native-tab-navigator';
export default class FirstApp extends Component {
    constructor(props){
       super(props);
       this.state={
           selectedTab:'home',
       }
       }
    render(){

    return (
<View style={styles.container}>
<TabNavigator>
<TabNavigator.Item
selected={this.state.selectedTab === 'home'}
title="Home"
renderIcon={() => <Image source={require('res/images/ic_popular.png')} />}
renderSelectedIcon={() => <Image source={require('res/images/ic_popular.png')} />}
badgeText="1"
onPress={() => this.setState({ selectedTab: 'home' })}>
{homeView}
<View style={styles.page1}></View>
</TabNavigator.Item>
<TabNavigator.Item
selected={this.state.selectedTab === 'profile'}
title="Profile"
renderIcon= {() => <Image source = {require('res/images/ic_trending.png')}/>}
        renderSelectedIcon = {() => <Image source = {require('res/images/ic_trending.png')} />}
        renderBadge = {() => <CustomBadgeView/> }
        onPress = {() => this.setState({selectedTab: 'profile'})}>
        {
            profileView
        }
        <View style={styles.page2}></View>
    </TabNavigator.Item>
        </TabNavigator>
        </View>
    );
    }
}
const styles = StyleSheet.create({
   container: {
       flex: 1,
       justifyContent: 'center',
       alignItems: 'center',
       backgroundColor: '#F5FCFF',
   },
    page1:{
       flex:1,
        backgroundColor: 'red',

    },
    page2:{
        flex:1,
        backgroundColor:'yellow',
    }
    });


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

C:\Users\ZHONGZHENHUA\FirstApp\package.json

{
  "name": "FirstApp",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest"
  },
  "dependencies": {
    "babel-preset-react-native": "^4.0.0",
    "react": "16.6.1",
    "react-native": "0.57.7",
    "react-native-tab-navigator": "^0.3.4"
  },
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-jest": "23.6.0",
    "jest": "23.6.0",
    "metro-react-native-babel-preset": "0.50.0",
    "react-test-renderer": "16.6.1"
  },
  "jest": {
    "preset": "react-native"
  }
}

C:\Users\ZHONGZHENHUA\FirstApp\package.json

{
  "name": "FirstApp",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest"
  },
  "dependencies": {
    "babel-core": "^6.26.3",
    "babel-loader": "^8.0.4",
    "babel-preset-react-native": "^4.0.0",
    "react": "16.6.1",
    "react-native": "0.57.7",
    "react-native-tab-navigator": "^0.3.4"
  },
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-jest": "23.6.0",
    "jest": "23.6.0",
    "metro-react-native-babel-preset": "0.50.0",
    "react-test-renderer": "16.6.1"
  },
  "jest": {
    "preset": "react-native"
  }
}