苹果审核被拒绝。
Guideline 4.2.3 - Design - Minimum Functionality
We were required to install the WeChat app before we could log in via WeChat. Users should be able to log in with WeChat and access their accounts without having to install any additional apps.
Next Steps
If you would like to offer authentication through WeChat, please use a mechanism that allows users to log in with WeChat from within your app without first having to install an additional app.
We recommend implementing the Safari View Controller API to display web content within your app. The Safari View Controller allows the display of a URL and inspection of the certificate from an embedded browser in an app so that customers can verify the webpage URL and SSL certificate to confirm they are entering their sign in credentials into a legitimate page.
Resources
For additional information on the Safari View Controller API, please review the What's New in Safari webpage.
了解一下苹果审核规则， 最好是看一遍苹果审核规则后，修改后，再提交审核，
1、如果有登录功能的，必须提供 测试帐号，
2、如果有第三方登录的，必须检测第三方应用是否已安装了，如果没有安装，就要把该项隐藏起来，不得提示用户安装才能使用
3、不得有更新提示，或者更新按钮
4、各种权限使用说明要写上，例如为什么要使用用户摄像头等等
5、不能有测试的字眼等等
如果还是审核不过，看到官方反馈什么问题，根据问题修改，到审核通过为止
if ([WXApi isWXAppInstalled]) { //有安装微信
如果有微信安装，就显示微信登录界面；
}
else //未安装微信
{
如果没有微信安装，就显示其他登录界面；
}
总之尽量不要给出提示，未安装微信.......
