IOS Alamofire从服务器下载文件

 191 @IBAction func
 touchupInsideDownloadingBtnAction(_ sender：AnyObject)
 192 {
 193 let destination =
 DownloadRequest.suggestedDownloadDestination(for：.documentDirectory)
 194
 195 Alamofire.download(
 “https：//httpbin.org/image/png”,to：destination)
 196 .downloadProgress { progress in
 197 print(“完成比例：(progress.fractionCompleted)”)
 198 print(“当前完成：(progress.completedUnitCount)”)
 199 print(“总共大小：(progress.totalUnitCount)”)
 200 }
 201 .responseData { response in
 202 if let data = response.result.value {
 203 let image = UIImage(data：data)
 204 }
 205
 206 let message = “下载图片结果：(response.result)”
 207 let alert = UIAlertController(title：“Information”,
 message：message, preferredStyle：
 UIAlertControllerStyle.alert)
 208 let OKAction = UIAlertAction(title：“OK”, style：
 UIAlertActionStyle.default, handler：nil)
 209 alert.addAction(OKAction)
 210 self.present(alert, animated：true, completion：nil)
 211 }
 212
 213 }