设置Alamofire自定义目标文件名，而不是使用suggestDownloadDestination

I got many lists of invoice file at my table view as well as many download buttons at each cell.When I clicked one of it,it will download the invoice file.But,the problem is the server response suggested file name is "invoice.pdf" at every file I downloaded.So,I need to edit the file name manually before I save to document after it was downloaded.So,how to edit the file name manually after it was download successfully and save it in document as temporaryurl without using I got many lists of invoice file at my table vi