10

我的表格视图中有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。但是，问题是服务器响应建议的文件名是“invoice. pdf”在我下载的每个文件中。所以，我需要手动编辑文件名，然后在下载后保存到文档中。所以，如何在下载成功后手动编辑文件名并将其保存为文档中的临时 URL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)
    }
  }

这是表格视图，它将检查下载的文件，当它点击时，显示在打开功能中。

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。我只是不想使用那个代码

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

因为它使用 response.suggestedfilename。而且我想在选定的表格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能清楚地看到它。

4

1 回答 1

15

目的地是类型(NSURL, NSHTTPURLResponse) -> NSURL。所以你可以做这样的事情

 Alamofire.download(.POST, invoice.url,parameters:params, 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, 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)
  }
}

斯威夫特 3.0

在 swift 3.0 中是DownloadFileDestination

 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)
    }
}

更多信息请访问Alamofire

于 2016-04-22T06:30:10.833 回答