swift - Send an IOS image across an api -

i have image trying send rails app via ios app.

step 1:

this grabs image uiview

@iboutlet var notifier: uilabel! @iboutlet var image: uiimage @ibaction func build(sender: anyobject) {     let image_data = uiimagepngrepresentation(image.image!)     self.service.createnewimage(notifier: notifier, image: image_data!) } 

step 2:

this service

func createnewimage(notifier: uilabel, image: nsdata) {     let datadictionary = ["image_data": image]     self.post("image/build", data: datadictionary).responsejson { (response) -> void in             if(response.description[response.description.startindex] character == "s") {                 notifier.text = "this should success"             } else {                 notifier.text  = "failure"             }       } } 

this code causes error: *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: 'invalid type in json write (nsconcretemutabledata)'

how package image send across api?

notes:

i believe issue coming line specifically:

    self.post("image/build", data: datadictionary).responsejson { (response) -> void in 

post defined as:

func post(path: string) -> request {      return self.post(path, data: nsdictionary()) }  func post(path: string, data: nsdictionary) -> request {    let  url = self.url_from_path(path)     return self.client.request(.post, url, parameters: data as? [string : anyobject] , encoding: parameterencoding.json,         headers: self.getheaders()) }  func patch(path: string, data: nsdictionary) -> request {     let  url = self.url_from_path(path)     return self.client.request(.patch, url, parameters: data as? [string : anyobject] , encoding: parameterencoding.json,         headers: self.getheaders()) }  

this works:

    let strbase64:string = image.base64encodedstringwithoptions(.encoding64characterlinelength)     let datadictionary = ["image_data": strbase64] 

you convert nsdata cannot put json base64 string can put json