https://developers.weixin.qq.com/community/develop/doc/00048c85c141089cd3d8082e85b400?highline=iOS%E6%9B%B4%E6%96%B0%E5%88%B0%E6%9C%80%E6%96%B0%E7%89%88%287.0.5%29%E7%9A%84%E5%BE%AE%E4%BF%A1%E5%90%8E%EF%BC%8C%E8%A7%86%E9%A2%91%E6%98%BE%E7%A4%BA%E5%87%BA%E7%8E%B0%E9%BB%91%E5%B1%8F%E3%80%82