Swift 带参数，POST网络上传文件

 static func infoModifyUploadHeadImg(realName:String,major:String,image:UIImage) {
        var params:Dictionary<String,String> = Dictionary()
        params["real_name"] = StringUtils.URLEncodedString(realName)
        params["major"] = major
        let imageData = UIImagePNGRepresentation(image)
        let urlRequest = AccountSessionUtils.urlRequestWithComponents(GetUrlUtils.getUrlRegData(), parameters: params, imageData: imageData!)
        Alamofire.upload(urlRequest.0, data: urlRequest.1)
            .progress { (bytesWritten, totalBytesWritten, totalBytesExpectedToWrite) in
                print("\(totalBytesWritten) / \(totalBytesExpectedToWrite)")
            }
            .responseJSON { response  in
//                
        }
    }
    // this function creates the required URLRequestConvertible and NSData we need to use Alamofire.upload
    static func urlRequestWithComponents(urlString:String, parameters:Dictionary<String, String>, imageData:NSData) -> (URLRequestConvertible, NSData) {
        
        // create url request to send
        let mutableURLRequest = NSMutableURLRequest(URL: NSURL(string: urlString)!)
        mutableURLRequest.HTTPMethod = Alamofire.Method.POST.rawValue
        let boundaryConstant = "myRandomBoundary12345";
        let contentType = "multipart/form-data;boundary="+boundaryConstant
        mutableURLRequest.setValue(contentType, forHTTPHeaderField: "Content-Type")
        
        
        
        // create upload data to send
        let uploadData = NSMutableData()
        
        // add image
        uploadData.appendData("\r\n--\(boundaryConstant)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
        uploadData.appendData("Content-Disposition: form-data; name=\"file\"; filename=\"file.png\"\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
        uploadData.appendData("Content-Type: image/png\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
        uploadData.appendData(imageData)
        
        // add parameters
        for (key, value) in parameters {
            uploadData.appendData("\r\n--\(boundaryConstant)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
            uploadData.appendData("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n\(value)".dataUsingEncoding(NSUTF8StringEncoding)!)
        }
        uploadData.appendData("\r\n--\(boundaryConstant)--\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)
        
        
        
        // return URLRequestConvertible and NSData
        return (Alamofire.ParameterEncoding.URL.encode(mutableURLRequest, parameters: nil).0, uploadData)
    }