iPhone 8 plus  使用wx.downloadFile下载后调用 wx.openDocument无反应 ?

 wx.downloadFile({
      url:url,
      success(res){
        console.log("当前下载文件状态", res.statusCode);
        if (res.statusCode+' ' == '404') {
          wx.showToast({
            image: '../../img/false.png',
            title: '文件未找到',
          })
        }else{
          const filePath = res.tempFilePath;
          wx.openDocument({
            filePath,
            success(res) {
              console.log("文档打开成功");
            }
          })
          
        }
        wx.hideLoading();
      }
    })