使用Apple 7plus,分享时无法自动生成图片
https://developers.weixin.qq.com/community/develop/doc/0008a285d88df015b2b7370f356000?highLine=%25E5%2588%2586%25E4%25BA%25AB%25E5%259B%25BE%25E7%2589%2587%25E7%25A9%25BA%25E7%2599%25BD
是不是这个问题
