Multiple file upload with array of parameters using Alamofire

问题

i have array of parameters and array of images each set of parameter contain one and only one image.my code

let imgData = UIImageJPEGRepresentation(imageView.image!, 0.2)!
  Alamofire.upload(multipartFormData: { multipartFormData in
    multipartFormData.append(imgData, withName: "fileset",fileName: "file.jpg", mimeType: "image/jpg")

      for (key, value) in params {
        multipartFormData.append(value.data(using: String.Encoding.utf8)!, withName: key)
      }
    },
                   to:URLUpdateProfile,
                   method:.post,
                   headers:headers)
    { (result) in
      switch result {
      case .success(let upload, _, _):

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

        upload.responseJSON { response in
          print(response.result.value)
        }

      case .failure(let encodingError):
        print(encodingError)  
      }
    }

with this code i am able to upload one image along with one parameter.but i want to send parameter in array and image in array too.is the way to upload array of params with array of image? if yes how to track image and parameter?

回答1:

You can upload each image and its param in an Operation. Your Operation should look something like this:

class UploadImageOperation: Operation {
private var image: UIImage

init(withImage: UIImage) {
    super.init()

    image = withImage
}

override func main() {
    let imgData = UIImageJPEGRepresentation(image, 0.2)!
    Alamofire.upload(multipartFormData: { multipartFormData in
        multipartFormData.append(imgData, withName: "fileset",fileName: "file.jpg", mimeType: "image/jpg")

        for (key, value) in params {
            multipartFormData.append(value.data(using: String.Encoding.utf8)!, withName: key)
        }
    },
                     to:URLUpdateProfile,
                     method:.post,
                     headers:headers)
    { (result) in
        switch result {
            case .success(let upload, _, _):

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

                upload.responseJSON { response in
                    print(response.result.value)
                }

            case .failure(let encodingError):
                print(encodingError)  
            }
        }
    }
}

Then you create the operations and add them to the queue like this:

let opQueue = OperationQueue()
opQueue.name = "imageUploadQueue"
opQueue.maxConcurrentOperationCount = 5 //number of images you want to be uploaded simultaneously
opQueue.qualityOfService = .background

for image in arrayOfImages {
    let uploadImageOperation = UploadImageOperation(withImage: image)
    opQueue.addOperation(uploadImageOperation)
}

来源：https://stackoverflow.com/questions/43972651/multiple-file-upload-with-array-of-parameters-using-alamofire