ios - How to post a tweet with Parse -

i'm trying publish tweet name of app on user's timeline after authorization. i'm trying this:

let tweet = "this tweet has been sent" let tweetbody = nsstring(format: "status=%@", tweet.stringbyaddingpercentencodingwithallowedcharacters(nscharacterset.urlqueryallowedcharacterset())!) tweetbody.stringbyreplacingoccurrencesofstring("!", withstring: "%21")  var url = nsurl(string: "https://api.twitter.com/1.1/statuses/update.json") var tweetrequest = nsmutableurlrequest(url: url!) tweetrequest.httpmethod = "post" tweetrequest.httpbody tweetbody.datausingencoding(nsutf8stringencoding)  twitter?.signrequest(tweetrequest)  alamofire.request(.post, tweetrequest, encoding: .json).validate().responsejson {     response in         switch response.result {            case .success:                if let value = response.result.value {                   let json = json(value)                   print(json)                }            case .failure(let error):                print(error)            }       } 

but fails , returns 400. how can fix code , send tweet via parse?

update

may can send tweet alamofire parameters https://api.twitter.com/1.1/statuses/update.json?