如何在ios应用程序中显示Web服务调用的进度条

    // like iam using SVProgress for uplaod an image
// for showing Progress iam getting Progress.fractionCompleted from uploadProgress
eg:-

     Alamofire.upload(multipartFormData: { (multipartFormData) in
            multipartFormData.append(data!, withName: "media", fileName: "media.jpeg", mimeType: "media/jpeg")
            for (key, value) in parameters! {
              multipartFormData.append((value as AnyObject).data(using: String.Encoding.utf8.rawValue)!, withName: key)
            }
          }, to:baseUrl,headers:parameters)
          { (result) in
            switch result {
            case .success(let upload, _, _):

              upload.uploadProgress(closure: { (Progress) in
                print("Upload Progress: \(Progress.fractionCompleted)")
                SVProgressHUD.showProgress(Float(Progress.fractionCompleted))
              })

              upload.responseJSON { response in
                //self.delegate?.showSuccessAlert()
                print(response.request)  // original URL request
                print(response.response) // URL response
                print(response.data)     // server data
                print(response.result)   // result of response serialization
                //                        self.showSuccesAlert()
                //self.removeImage("frame", fileExtension: "txt")
            SVProgressHUD.dismiss()

// Hope its works for you..