Alamofire request body nil when uploading image using multipartFormData - swift

Question

I seem to have a problem regarding image upload and passing parameters using Alamofire. I have a quite simple function for multipart data which looks like:
sessionManager.upload(multipartFormData: { (multipartFormData) in
for (key, value) in parameters {
print("\(value)")
multipartFormData.append("\(value)".data(using: String.Encoding.utf8)!, withName: key as String)
}
multipartFormData.append(UIImagePNGRepresentation(image)!, withName: "document", mimeType: "image/png")
}, to: baseURL + "/documents", encodingCompletion: { (result) in
switch result{
case .success(let upload, _, _):
upload.validate().responseJSON { response in
print("Succesfully uploaded")
}
case .failure(let error):
print("Error in upload: \(error.localizedDescription)")
}
})
I have OAuth2Handler which i've implemented for headers and authorisation and it works for all other requests. I have also tried to implement this without wrapper using Alamofire object directly but still no luck. When I inspect the request i notice that httpBody is always nil, which corresponds to error I get from the server and the message says that I do not pass required parameters.

Answer 1

This is Working for me Swift 4
func callPostApiImage(api:String, parameters:[String:AnyObject]?,image:UIImage,Name:String, mime_type:String = "image/jpg", complition:#escaping (AnyObject)->Void){
// Encode Data
let base64EncodedString = toBase64EncodedString(toJsonString(parameters: parameters!))
let File_name = "image_" + String(arc4random()) + ".jpg"
Alamofire.upload(multipartFormData: { (multipartFormData) in
multipartFormData.append(UIImageJPEGRepresentation(image, 0.5)!, withName: Name, fileName: File_name, mimeType: mime_type)
multipartFormData.append(base64EncodedString.data(using: String.Encoding.utf8)!, withName: "jsondata")
}, to:api){ (result) in
switch result {
case .success(let upload, _, _):
upload.uploadProgress(closure: { (progress) in
print(progress)
})
upload.responseJSON { response in
print(response.result)
}
case .failure(let encodingError):
print("",encodingError.localizedDescription)
break
}
}
}
// Base64EncodedString
func toBase64EncodedString(_ jsonString : String) -> String
{
let utf8str = jsonString.data(using: .utf8)
let base64Encoded = utf8str?.base64EncodedString(options: [])
return base64Encoded!
}