AlamofireMultipartUpload.swift

    // This function creates the required URLRequestConvertible and NSData we need to use Alamofire.upload
    func urlRequestComponentsWithParams(urlString:String, parameter: [String: AnyObject], imageData:[NSData], inputName: String) -> (URLRequestConvertible, NSData) {
        
        // create url request to send
        let mutableURLRequest = NSMutableURLRequest(URL: NSURL(string: urlString)!)
        mutableURLRequest.HTTPMethod = Alamofire.Method.PUT.rawValue
        let boundaryConstant = "FileUploader-boundary-\(arc4random())-\(arc4random())";
        let contentType = "multipart/form-data;boundary="+boundaryConstant
        mutableURLRequest.setValue(contentType, forHTTPHeaderField: "Content-Type")

        // create upload data to send
        let uploadData = NSMutableData()
        
        for var i = 0; i < imageData.count; ++i {
            // add image
            uploadData.appendData("\r\n--\(boundaryConstant)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
            uploadData.appendData("Content-Disposition: form-data; name=\"\(inputName)\(i+1)\"; filename=\"image\(i+1).jpg\"\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
            uploadData.appendData("Content-Type: image/jpeg\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
            uploadData.appendData(imageData[i])
        }
        
        // add parameters
        for (key, value) in parameter {
            uploadData.appendData("\r\n--\(boundaryConstant)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
            uploadData.appendData("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n\(value)".dataUsingEncoding(NSUTF8StringEncoding)!)
            print("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n\(value)")
        }
        uploadData.appendData("\r\n--\(boundaryConstant)--\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
        
        print("Content-Disposition: form-data; name=\"\(inputName)\"; filename=\"image.jpg\"\r\n")
        
        // return URLRequestConvertible and NSData
        return (Alamofire.ParameterEncoding.URL.encode(mutableURLRequest, parameters: nil).0, uploadData)
    }
    
    func uploadMultipart(path: String, params: [String: AnyObject], data: [NSData], multiPartFormName: String,
        success: (responseObject: AnyObject?) -> Void,
        progress: (responseProgress: Float) -> Void,
        failure: (error: NSError?) -> Void) {
            
            let url = "\(self.kStringBaseURL)\(path)"
            let urlRequest = urlRequestComponentsWithParams(url, parameter: params, imageData: data, inputName: multiPartFormName)
            
            Alamofire.upload(urlRequest.0, data: urlRequest.1)
                .progress { (bytesWritten, totalBytesWritten, totalBytesExpectedToWrite) -> Void in
//                    println("\(totalBytesWritten) / \(totalBytesExpectedToWrite)")
                    return progress(responseProgress: Float(totalBytesWritten))
                }
                .responseString(encoding: nil) { (httpResp) -> Void in
                    if(httpResp.result.isFailure) {
//                        println("Failure: \(responseError!.userInfo)")
                        return failure(error: httpResp.result.error!)
                    } else {
                        if (httpResp.response?.statusCode == 200) {
                            return success(responseObject: httpResp.result.value!)
                        } else {
                            UIAlertView(title: "Sorry, something went wrong.", message: httpResp.result.value!, delegate: self, cancelButtonTitle: "OK").show()
                            SVProgressHUD.dismiss()
                        }
                    }
            }
    }