Issue while hitting Post Method api in swift - swift

Question

I'm trying to call an API in which I'm trying to send some parameters and array of images, but when I hit the API I get an error, Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber dataUsingEncoding:]: unrecognized selector sent to instance 0xfb47bab3e1e91166'. I have checked through breakpoint it crashes on parameters, I'm confused why it is giving this error, my code for the API is this,
func addAPI()
{
let headers: HTTPHeaders = [
/* "Authorization": "your_access_token", in case you need authorization header */
"Content-type": "multipart/form-data"
]
let parameters :[String: Any] = ["name":productNameTxt.text!,
"price":priceTxt.text!,
"size": sizeTxt.text!,
"weight":weightTxt.text!,
"quality":qualityTxt.text!,
"brand":brandTxt.text!,
"shippingCost":shippingCostTxt.text!,
"details":detailTxt.text!,
"material_id":materialId,
"material_type_id": subMaterialId,
"maxQuantity":4]
Alamofire.upload(multipartFormData: { multipartFormData in
for (key, value) in parameters {
if let data = ((value) as AnyObject).data(using: String.Encoding.utf8.rawValue) {
multipartFormData.append(data, withName: key)
}
}
for (index, image) in self.imageArray.enumerated() {
multipartFormData.append(image.pngData()!, withName: "file", fileName: "image\(index).png", mimeType: "image/png")
}
// for i in 0..
},
to: addProductUrl,method:HTTPMethod.post,
headers:headers, encodingCompletion: { encodingResult in
switch encodingResult {
case .success(let upload, _, _):
upload
.validate()
.responseJSON { response in
switch response.result {
case .success(let value):
// compBlock(value as AnyObject,true)
print("responseObject: \(value)")
case .failure(let responseError):
print("responseError: \(responseError)")
}
}
case .failure(let encodingError):
print("encodingError: \(encodingError)")
let errorDesc = (encodingError as NSError).localizedDescription
//failure(errorDesc as NSString,false)
}
})
}
What is this error for and how I can remove it?

Answer 1

From here
if let data = ((value) as AnyObject).data(using: String.Encoding.utf8.rawValue) {
then any passed value have to be converted to Data and since you specify an integer ( NSNumber when wrapped inside json) hence the crash so change 4 to "4" and
"material_id":"\(materialId)",

Answer 2

It would be better if you follow like this:
//[String:String] instead of [String : Any]
let parameters :[String: String] = ["name":productNameTxt.text!,
"price":priceTxt.text!,
"size": sizeTxt.text!,
"weight":weightTxt.text!,
"quality":qualityTxt.text!,
"brand":brandTxt.text!,
"shippingCost":shippingCostTxt.text!,
"details":detailTxt.text!,
"material_id":"\(materialId)",
"material_type_id": subMaterialId,
"maxQuantity":4]
multipartFormData.append((value.data(using: .utf8))!, withName: key)