swift – 设置Alamofire自定义目标文件名,而不是使用suggestDown

我在桌面视图中获得了许多发票文件列表以及每个单元格中的许多下载按钮.当我单击其中一个时,它将下载发票文件.但问题是服务器响应建议文件名是“发票”. pdf“在我下载的每个文件中.因此,我需要手动编辑文件名,然后在下载后保存到文档.所以,如何在成功下载后手动编辑文件名,并将其作为临时文件保存在文档中使用Alamofire.Request.suggestedDownloadDestination.

这是我的下载功能.

func downloadInvoice(invoice: Invoice,completionHandler: (Double?,NSError?) -> Void) {

guard isInvoiceDownloaded(invoice) == false else {
  completionHandler(1.0,nil) // already have it
  return
}

let params = [
    "AccessToken" : “xadijdiwjad12121”]

// Can’t use the destination file anymore because my server only return one file name “invoice.pdf” no matter which file i gonna download
// So I have to manually edit my file name which i saved after it was downloaded.    
let destination = Alamofire.Request.suggestedDownloadDestination(directory: .DocumentDirectory,domain: .UserDomainMask)
// So I have to save file name like that ““2016_04_02_car_invoice_10021.pdf” [Date_car_invoice_timestamp(Long).pdf]
// Please look comment on tableView code

Alamofire.Manager.sharedInstance.session.configuration.HTTPAdditionalHeaders?.updateValue("application/pdf",forKey: "Content-Type")

Alamofire.download(.POST,invoice.url,parameters:params,destination: destination)
      .progress { bytesRead,totalBytesRead,totalBytesExpectedToRead in
        print(totalBytesRead)
        dispatch_async(dispatch_get_main_queue()) {
          let progress = Double(totalBytesRead) / Double(totalBytesExpectedToRead)
          completionHandler(progress,nil)
        }
      }
      .responseString { response in
        print(response.result.error)
        completionHandler(nil,response.result.error)
    }
  }

这是表视图,它将检查下载的文件以及何时单击,在打开的功能中显示.

override func tableView(tableView: UITableView,didSelectRowAtIndexPath indexPath: NSIndexPath) {
if let invoice = dataController.invoices?[indexPath.row] {
  dataController.downloadInvoice(invoice) { progress,error in
    // TODO: handle error
    print(progress)
    print(error)
    if (progress < 1.0) {
      if let cell = self.tableView.cellForRowAtIndexPath(indexPath),invoiceCell = cell as? InvoiceCell,progressValue = progress {
        invoiceCell.progressBar.hidden = false
        invoiceCell.progressBar.progress = Float(progressValue)
        invoiceCell.setNeedsDisplay()
      }
    }
    if (progress == 1.0) {
    // Here where i gonna get the downloaded file name from my model.
        // invoice.filename = (Assume “2016_04_02_car_invoice_10021”)
        if let filename = invoice.filename{
            let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory,.UserDomainMask,true)
            let docs = paths[0]
            let pathURL = NSURL(fileURLWithPath: docs,isDirectory: true)
            let fileURL = NSURL(fileURLWithPath: filename,isDirectory: false,relativeToURL: pathURL)

            self.docController = UIDocumentInteractionController(URL: fileURL)
            self.docController?.delegate = self
            if let cell = self.tableView.cellForRowAtIndexPath(indexPath) {
                self.docController?.presentOptionsMenuFromRect(cell.frame,inView: self.tableView,animated: true)
                if let invoiceCell = cell as? InvoiceCell {
                    invoiceCell.accessoryType = .Checkmark
                    invoiceCell.setNeedsDisplay()
                }
            }
        }
    }
  }
}
}

所以,我的问题很简单.我只是不想使用该代码

let destination = Alamofire.Request.suggestedDownloadDestination(directory: .DocumentDirectory,domain: .UserDomainMask)

因为它使用response.suggestedfilename.And我想在选定的表视图单元格数据上手动保存文件名.任何帮助？请不要介意我在我的问题中发布了一些代码,因为我希望每个人都清楚地看到它.

Alamofire.download(.POST,destination: { (url,response) -> NSURL in

    let pathComponent = "yourfileName"

    let fileManager = NSFileManager.defaultManager()
    let directoryURL = fileManager.URLsForDirectory(.DocumentDirectory,inDomains: .UserDomainMask)[0]
    let fileUrl = directoryURL.URLByAppendingPathComponent(pathComponent)
    return fileUrl
    })
  .progress { bytesRead,totalBytesExpectedToRead in
    print(totalBytesRead)
    dispatch_async(dispatch_get_main_queue()) {
      let progress = Double(totalBytesRead) / Double(totalBytesExpectedToRead)
      completionHandler(progress,nil)
    }
    }
    .responseString { response in
      print(response.result.error)
      completionHandler(nil,response.result.error)
  }
}

Alamofire.download(url,method: .get,to: { (url,response) -> (destinationURL: URL,options: DownloadRequest.DownloadOptions) in
  return (filePathURL,[.removePreviousFile,.createIntermediateDirectories])
})
 .downloadProgress(queue: utilityQueue) { progress in
    print("Download Progress: (progress.fractionCompleted)")
}
.responseData { response in
    if let data = response.result.value {
        let image = UIImage(data: data)
    }
}