How to cancel Alamofire.upload

Question

I am uploading images on server via Alamofire.upload as multipart data. Unlike Alamofire.request it's not returning Request object, which I usually use to cancel requests.

But it's very reasonable to be able to cancel such a consuming requests like uploading. What are the options for this in Alamofire?

Answer 1

Using the Uploading MultiPartFormData example from the Alamofire README:

Alamofire.upload(
    .POST,
    "https://httpbin.org/post",
    multipartFormData: { multipartFormData in
        multipartFormData.appendBodyPart(fileURL: unicornImageURL, name: "unicorn")
        multipartFormData.appendBodyPart(fileURL: rainbowImageURL, name: "rainbow")
    },
    encodingCompletion: { encodingResult in
        switch encodingResult {
        case .Success(let upload, _, _):
            upload.responseJSON { response in
                debugPrint(response)
            }
        case .Failure(let encodingError):
            print(encodingError)
        }
    }
)

Here, upload.responseJSON returns a Request, which should allow you to assign it to something for cancellation later. For example:

let request = upload.responseJSON {  ...

...

request.cancel()