TaxControlAppTest/components/wechat/weChat.js

import * as WeChat from 'react-native-wechat';
import {Alert, Platform} from 'react-native';

//微信免登
export const loginWeChat = () => {
  let scope = 'snsapi_userinfo';
  let state = 'wechat_sdk_demo';
  //判断微信是否安装
  WeChat.isWXAppInstalled().then(isInstalled => {
    if (isInstalled) {
      //发送授权请求
      WeChat.sendAuthRequest(scope, state)
        .then(responseCode => {
          //返回code码，通过code获取access_token
          console.log(responseCode);
          // this.getAccessToken(responseCode.code);
        })
        .catch(err => {
          return Alert.alert('登录授权发生错误：', err.message, [{text: '确定'}]);
        });
    } else {
      return Platform.OS == 'ios'
        ? Alert.alert('没有安装微信', '是否安装微信？', [
            {text: '取消'},
            {text: '确定', onPress: () => {}},
          ])
        : Alert.alert('没有安装微信', '请先安装微信客户端在进行登录', [
            {text: '确定'},
          ]);
    }
  });
};