Send POST parameters with MultipartFormData using Alamofire, in iOS Swift

Swift 3 / Alamofire 4.0 (Addendum to the accepted answer)

To append to multipartFormData in Swift 3 / Alamofire 4.0, use the following method of MultipartFormData:

public func append(_ data: Data, withName name: String) { /* ... */ }

And, to convert String to Data, the data(using:) method of String. E.g.,

multipartFormData.append("comment".data(using: .utf8)!, withName: "comment")

This is how i solve my problem

let parameters = [
            "station_id" :        "1000",
            "title":      "Murat Akdeniz",
            "body":        "xxxxxx"]

let imgData = UIImageJPEGRepresentation(UIImage(named: "1.png")!,1)



    Alamofire.upload(
        multipartFormData: { MultipartFormData in
        //    multipartFormData.append(imageData, withName: "user", fileName: "user.jpg", mimeType: "image/jpeg")

            for (key, value) in parameters {
                MultipartFormData.append(value.data(using: String.Encoding.utf8)!, withName: key)
            }

        MultipartFormData.append(UIImageJPEGRepresentation(UIImage(named: "1.png")!, 1)!, withName: "photos[1]", fileName: "swift_file.jpeg", mimeType: "image/jpeg")
        MultipartFormData.append(UIImageJPEGRepresentation(UIImage(named: "1.png")!, 1)!, withName: "photos[2]", fileName: "swift_file.jpeg", mimeType: "image/jpeg")


    }, to: "http://platform.twitone.com/station/add-feedback") { (result) in

        switch result {
        case .success(let upload, _, _):

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

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


    }

I found the solution :) finally.

We can append data in the request as multipartformdata.

Below is my code.

  Alamofire.upload(
        .POST,
        URLString: fullUrl, // http://httpbin.org/post
        multipartFormData: { multipartFormData in
            multipartFormData.appendBodyPart(fileURL: imagePathUrl!, name: "photo")
            multipartFormData.appendBodyPart(fileURL: videoPathUrl!, name: "video")
            multipartFormData.appendBodyPart(data: Constants.AuthKey.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!, name :"authKey")
            multipartFormData.appendBodyPart(data: "\(16)".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!, name :"idUserChallenge")
            multipartFormData.appendBodyPart(data: "comment".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!, name :"comment")
            multipartFormData.appendBodyPart(data:"\(0.00)".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!, name :"latitude")
            multipartFormData.appendBodyPart(data:"\(0.00)".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!, name :"longitude")
            multipartFormData.appendBodyPart(data:"India".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!, name :"location")
        },
        encodingCompletion: { encodingResult in
            switch encodingResult {
            case .Success(let upload, _, _):
                upload.responseJSON { request, response, JSON, error in


                }
            case .Failure(let encodingError):

            }
        }
    )

EDIT 1: For those who are trying to send an array instead of float, int or string, They can convert their array or any kind of data-structure in Json String, pass this JSON string as a normal string. And parse this json string at backend to get original array

In Alamofire 4 it is important to add the body data before you add the file data!

let parameters = [String: String]()
[...]
self.manager.upload(
    multipartFormData: { multipartFormData in
        for (key, value) in parameters {
            multipartFormData.append(value.data(using: .utf8)!, withName: key)
        }
        multipartFormData.append(imageData, withName: "user", fileName: "user.jpg", mimeType: "image/jpeg")
    },
    to: path,
    [...]
)