// 缓存图片        private func cacheImages(_ viewModels: [StatusViewModel]) {            let group = DispatchGroup()            for viewModel in viewModels {                for picURL in viewModel.picURLs {                    group.enter()                    SDWebImageManager.shared.loadImage(with: picURL, options: [], progress: nil) { (_, _, _, _, _, _) in                        group.leave()                    }                }            }            group.notify(queue: DispatchQueue.main) {                // 刷新表格                self.tableView.reloadData()                // 停止刷新                self.tableView.mj_header?.endRefreshing()                self.tableView.mj_footer?.endRefreshing()            }        }