ios - Passing userID with photo POST Swift -

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i have upload function sends photo server using post method. want include variable userid (currentuser) in service. have following code, when switch let param = ["userid" : "1"] let param = [currentuser] error. currentuser declared string function calls cant figure out whats wrong.

func myimageuploadrequest(){         let myurl = nsurl(string: "http://server.com/posttest/imageupload.php");          let request = nsmutableurlrequest(url:myurl!);         request.httpmethod = "post";          let param = ["userid" : "1"]          let boundary = generateboundarystring()          request.setvalue("multipart/form-data; boundary=\(boundary)", forhttpheaderfield: "content-type")          let imagedata = uiimagejpegrepresentation(myimageview.image, 1)          if(imagedata==nil)  { return; }          request.httpbody = createbodywithparameters(param, filepathkey: "imagefile", imagedatakey: imagedata, boundary: boundary)


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