wx.downloadFile({

    url: 'https://res.wx.qq.com/wxdoc/dist/assets/img/demo.ef5c5bef.jpg',//分享的图片的链接

    success: (res) => {

      wx.showShareImageMenu({

        path: res.tempFilePath

      })

    }

只支持安卓用户，ios用户不支持，怎么解决ios用户分享图片给微信好友