react-native 微信登录示例代码片段

App.js

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 *
 * @format
 * @flow
 * @lint-ignore-every XPLATJSCOPYRIGHT1
 */

import React, {Component} from 'react';
import {Platform, StyleSheet, Text, View, Alert } from 'react-native';
import * as WeChat from 'react-native-wechat'
import { from, of } from 'rxjs'
import { switchMap, map } from 'rxjs/operators'


const instructions = Platform.select({
  ios: 'Press Cmd+R to reload,\n' + 'Cmd+D or shake for dev menu',
  android:
    'Double tap R on your keyboard to reload,\n' +
    'Shake or press menu button for dev menu',
});

type Props = {};
export default class App extends Component<Props> {

  componentDidMount () {

    // 注册, todo: 这里从微信那申请来的填写 appid
    from(WeChat.registerApp('xxx'))
      .pipe(
        switchMap(() => from(WeChat.isWXAppInstalled())),
        map(installed => {
          if (!installed) {
            console.log('是否安装着微信: ', installed)
            throw Error('未安装微信')
          }
        }),
        // 授权
        switchMap(() => from(WeChat.sendAuthRequest('snsapi_userinfo'))),
        // 拿到 code, 去后台登录
        switchMap((payload) => {
          return of(payload)
        }),
      ).subscribe(
      res => {
        console.log('res', res)
        // todo: 登录成功, 存起来
      },
      err => {
        console.log('err', err.message)
        // 出错, 提示用户
        Alert.alert(err.message)
      },
    )
  }

  render() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>Welcome to React Native!</Text>
        <Text style={styles.instructions}>To get started, edit App.js</Text>
        <Text style={styles.instructions}>{instructions}</Text>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});