如何在ios中的同一POST请求中发送form-data和x-www-form-urlencoded？

I have a problem. I am making POST request to server. In which I am uploading an Image with user_id of User.I need to send user_id in x-www-form-urlencoded and Image in from-data. I tried many ways but every time user_id is undefined in server. How can I send both in same request. Here is my I have a problem. I am making POST request to s