Based on react-native+react-navigation+react+redux+react-native-image-picker+react-native-swiper and other technical framework development High imitation WeChat app example RN_chatroom . The functions of message sending, TextInput text box mixing emoticons, expression maps, picture selection preview, red envelope, circle of friends and so on are realized.

Technical framework

• rn scaffolding: react/react-native/react-native-cli
• State management: react-redux
• Page navigation: react-navigation
• rn Bullet Window Component: rnPop
• Packaging tool: webpack 2.0
• Rotary component: react-native-swiper
• Picture selection: react-native-image-picker

Create the bottom navigation bar tabbar through react-navigation

// Create the bottom TabBar
const tabNavigator = createBottomTabNavigator(
    // tabbar routing (message, address book, I)
    {
        Index: {
            screen: Index,
            navigationOptions: ({navigation}) => ({
                tabBarLabel: 'news',
                tabBarIcon: ({focused, tintColor}) => (
                    <View>
                        <Text style={[ GStyle.iconfont, GStyle.fs_20, {color: (focused ? tintColor : '#999')} ]}>&#xe642;</Text>
                        <View style={[GStyle.badge, {position: 'absolute', top: -2, right: -15,}]}><Text style={GStyle.badge_text}>12</Text></View>
                    </View>
                )
            })
        },
        Contact: {
            screen: Contact,
            navigationOptions: {
                tabBarLabel: 'Mail list',
                tabBarIcon: ({focused, tintColor}) => (
                    <View>
                        <Text style={[ GStyle.iconfont, GStyle.fs_20, {color: (focused ? tintColor : '#999')} ]}>&#xe640;</Text>
                    </View>
                )
            }
        },
        Ucenter: {
            screen: Ucenter,
            navigationOptions: {
                tabBarLabel: 'I',
                tabBarIcon: ({focused, tintColor}) => (
                    <View>
                        <Text style={[ GStyle.iconfont, GStyle.fs_20, {color: (focused ? tintColor : '#999')} ]}>&#xe61e;</Text>
                        <View style={[GStyle.badge_dot, {position: 'absolute', top: -2, right: -6,}]}></View>
                    </View>
                )
            }
        }
    },
    // tabbar configuration
    {
        ...
    }
)

App Page Introduces Common Components and Routing Page Navigator

import React, { Fragment, Component } from 'react'
import { StatusBar } from 'react-native'

// Introducing common js
import './src/utils/util'
import './src/utils/storage'

// Import style
import './src/assets/css/common'
// Import rnPop Bullet Window
import './src/assets/js/rnPop/rnPop.js'

// Introducing Page Routing
import PageRouter from './src/router'

class App extends Component{
  render(){
    return (
      <Fragment>
        {/* <StatusBar backgroundColor={GStyle.headerBackgroundColor} barStyle='light-content' /> */}

        {/* page */}
        <PageRouter />

        {/* Pop-up template */}
        <RNPop />
      </Fragment>
    )
  }
}

export default App

Customizing headerBar Component of Top Navigation Bar Based on Reaction-Navigation

export default class HeaderBar extends Component {
    constructor(props){
        super(props)
        this.state = {
            searchInput: ''
        }
    }

    render() {
        /**
         * To update
         * @param { navigation | Page Navigation}
         * @param { title | Title}
         * @param { center | Is the title in the middle}
         * @param { search | Whether to display search}
         * @param { headerRight | Right Icon button}
         */
        let{ navigation, title, bg, center, search, headerRight } = this.props

        return (
            <View style={GStyle.flex_col}>
                <StatusBar backgroundColor={bg ? bg : GStyle.headerBackgroundColor} barStyle='light-content' translucent={true} />
                <View style={[styles.rnim__topBar, GStyle.flex_row, {backgroundColor: bg ? bg : GStyle.headerBackgroundColor}]}>
                    {/* Return */}
                    <TouchableOpacity style={[styles.iconBack]} activeOpacity={.5} onPress={this.goBack}><Text style={[GStyle.iconfont, GStyle.c_fff, GStyle.fs_18]}>&#xe63f;</Text></TouchableOpacity>
                    {/* Title */}
                    { !search && center ? <View style={GStyle.flex1} /> : null }
                    {
                        search ? 
                        (
                            <View style={[styles.barSearch, GStyle.flex1, GStyle.flex_row]}>
                                <TextInput onChangeText={text=>{this.setState({searchInput: text})}} style={styles.barSearchText} placeholder='search' placeholderTextColor='rgba(255,255,255,.6)' />
                            </View>
                        )
                        :
                        (
                            <View style={[styles.barTit, GStyle.flex1, GStyle.flex_row, center ? styles.barTitCenter : null]}>
                                { title ? <Text style={[styles.barCell, {fontSize: 16, paddingLeft: 0}]}>{title}</Text> : null }
                            </View>
                        )
                    }
                    {/* Right */}
                    <View style={[styles.barBtn, GStyle.flex_row]}>
                        { 
                            !headerRight ? null : headerRight.map((item, index) => {
                                return(
                                    <TouchableOpacity style={[styles.iconItem]} activeOpacity={.5} key={index} onPress={()=>item.press ? item.press(this.state.searchInput) : null}>
                                        {
                                            item.type === 'iconfont' ? item.title : (
                                                typeof item.title === 'string' ? 
                                                <Text style={item.style ? item.style : null}>{`${item.title}`}</Text>
                                                :
                                                <Image source={item.title} style={{width: 24, height: 24, resizeMode: 'contain'}} />
                                            )
                                        }
                                        {/* Dot */}
                                        { item.badge ? <View style={[styles.iconBadge, GStyle.badge]}><Text style={GStyle.badge_text}>{item.badge}</Text></View> : null }
                                        { item.badgeDot ? <View style={[styles.iconBadgeDot, GStyle.badge_dot]}></View> : null }
                                    </TouchableOpacity>
                                )
                            })
                        }
                    </View>
                </View>
            </View>
        )
    }

    goBack = () => {
        this.props.navigation.goBack()
    }
}

Reaction-native Realization of Full Screen Start Animation

/**
 * @desc start page
 */

import React, { Component } from 'react'
import { StatusBar, Animated, View, Text, Image } from 'react-native'

export default class Splash extends Component{
    constructor(props){
        super(props)
        this.state = {
            animFadeIn: new Animated.Value(0),
            animFadeOut: new Animated.Value(1),
        }
    }

    render(){
        return (
            <Animated.View style={[GStyle.flex1DC_a_j, {backgroundColor: '#1a4065', opacity: this.state.animFadeOut}]}>
                <StatusBar backgroundColor='transparent' barStyle='light-content' translucent={true} />

                <View style={GStyle.flex1_a_j}>
                    <Image source={require('../assets/img/ic_default.jpg')} style={{borderRadius: 100, width: 100, height: 100}} />
                </View>
                <View style={[GStyle.align_c, {paddingVertical: 20}]}>
                    <Text style={{color: '#dbdbdb', fontSize: 12, textAlign: 'center',}}>RN-ChatRoom v1.0.0</Text>
                </View>
            </Animated.View>
        )
    }

    componentDidMount(){
        // Determine whether to log in or not
        storage.get('hasLogin', (err, object) => {
            setTimeout(() => {
                Animated.timing(
                    this.state.animFadeOut, {duration: 300, toValue: 0}
                ).start(()=>{
                    // Jump page
                    util.navigationReset(this.props.navigation, (!err && object && object.hasLogin) ? 'Index' : 'Login')
                })
            }, 1500);
        })
    }
}

Emotions are emoj emoticons

Two examples of recent projects are attached.
Vue Web Chat Room: https://cloud.tencent.com/developer/article/1420150
angular Chat Room: https://cloud.tencent.com/developer/article/1464674