如何附加字符串数组以形成数据

Question

I want to send file with other parameters.I was able to send that using alamofire upload.but the question is in my parameters i have String arrays.I dont know how to append them in to form data.

let parameters = ["comments":comments!,
                      "title":title!,
                      "publish_date":publish_date,
                      "expiry_date":expiry_date,
                      "visibility[staff]":"N",
                       "visibility[students][Forms]":["1","2"]

        ]
        ]
        as [String : Any]
    let headers = [

        "Content-type": "multipart/form-data"
    ]

    let URL_head = try! URLRequest(url: STAFF_SERVICE_URL + "staff/2/news?api_key=\(api_key)", method: .post, headers: headers)


    Alamofire.upload(multipartFormData: { (multipartFormData) in


        if let url = fileUrl{
            multipartFormData.append(url, withName: "file")
        }
        for (key, value) in parameters {
   multipartFormData.append("\(value)".data(using: String.Encoding.utf8)!, withName: key as String)

        }
        print(multipartFormData)
    }, with:URL_head)
    { (result) in
        switch result {
        case .success(let upload, _, _):


            upload.responseJSON { response in
                NSLog("Upload  response \(response)")
                if let jsonValue = response.result.value {
                    _ = JSON(jsonValue)
                    completion(true ,"Suucess")


                }else{
                    completion(false ,"Error")
                }

            }

        case .failure(let encodingError):
            print("fail \(encodingError)")
            NSLog("Error \(result)")
            completion(false ,"No Internet")
        }

    }
}

i tried to encode array seperately like this.but not worked.

 let data = try! JSONSerialization.data(withJSONObject: array, 
 options:.prettyPrinted)
 let jsonString = String(data: data, encoding: .utf8)!

Answer 1

You can directly pass data object you don't need to convert back to string

for example

 for (key, value) in parameters {
        if checkIfItIsArray {
            // Make sure you handle error here
            let data = try! JSONSerialization.data(withJSONObject: array,  options:nil)
           multipartFormData.append(data, withName: key as String)

        } else {
          multipartFormData.append("\(value)".data(using: String.Encoding.utf8)!, withName: key as String)
          }

    }