How to convert this to a POST call with a JSON serialized Object - swift

Question

I have tried Alamofire, I have tried it with all my heart. It just does not work for me. I finally got http GET working, but I need to get http POST working. Our POST API's take a Request object that has all the necessary data in it. I have requested the backend developers to provide me with a KEY-VALUE pair JSON (no embedded objects/arrays) so that I can use a Dictionary in my swift code convert that to json and send the request. All I need is now to convert the below code to POST.
My earlier questions that did not help much.
NSInvalidArgumentException Invalid type in JSON write DemographicsPojo
Swift 3.0, Alamofire 4.0 Extra argument 'method' in call
I have given up on Alamofire. I want to use Foundation classes. Simple basic and fundamental way of life :).
func callWebService(url : String) {
// Show MBProgressHUD Here
var config :URLSessionConfiguration!
var urlSession :URLSession!
config = URLSessionConfiguration.default
urlSession = URLSession(configuration: config)
// MARK:- HeaderField
let HTTPHeaderField_ContentType = "Content-Type"
// MARK:- ContentType
let ContentType_ApplicationJson = "application/json"
//MARK: HTTPMethod
let HTTPMethod_Get = "GET"
let callURL = URL.init(string: url)
var request = URLRequest.init(url: callURL!)
request.timeoutInterval = 60.0 // TimeoutInterval in Second
request.cachePolicy = URLRequest.CachePolicy.reloadIgnoringLocalCacheData
request.addValue(ContentType_ApplicationJson, forHTTPHeaderField: HTTPHeaderField_ContentType)
request.httpMethod = HTTPMethod_Get
let dataTask = urlSession.dataTask(with: request) { (data,response,error) in
if error != nil{
print("Error **")
return
}
do {
let resultJson = try JSONSerialization.jsonObject(with: data!, options: []) as? [String:AnyObject]
print("Result",resultJson!)
} catch {
print("Error -> \(error)")
}
}
dataTask.resume()
print("..In Background..")
}

Answer 1

Just pass JSON string and the API URL to this function. Complete code for POST.
func POST(api:String,jsonString:String,completionHandler:#escaping (_ success:Bool,_ response:String?,_ httpResponseStatusCode:Int?) -> Void) {
let url = URL(string: api)
var request: URLRequest = URLRequest(url: url!)
request.httpMethod = "POST"
request.setValue("application/json", forHTTPHeaderField:"Content-Type")
request.timeoutInterval = 60.0
//additional headers
if let token = Helper.readAccessToken() {
request.setValue("\(token)", forHTTPHeaderField: "Authorization")
}
let jsonData = jsonString.data(using: String.Encoding.utf8, allowLossyConversion: true)
request.httpBody = jsonData
let task = URLSession.shared.dataTask(with: request) {
(data: Data?, response: URLResponse?, error: Error?) -> Void in
var responseCode = 0
if let httpResponse = response as? HTTPURLResponse {
responseCode = httpResponse.statusCode
print("responseCode \(httpResponse.statusCode)")
}
if error != nil {
completionHandler(false, error?.localizedDescription,nil)
} else {
let responseString = String(data: data!, encoding: .utf8)
completionHandler(true, responseString, responseCode)
}
}
task.resume()
}