How to add parameters to JSON in function in swift - json

Question

I have created one function for JSON parsing, which I am calling in every view controller, but i am unable to pass parameters from that function
i have created function in NSObject class:
func serviceCall(_ url: String, _ params:[String : Any], completion: #escaping (Data?, Error?) -> Void) {
let url = URL(string: url)!
var urlRequest = URLRequest(url: url)
urlRequest.httpMethod = "POST" //set http method as POST
do {
urlRequest.httpBody = try JSONSerialization.data(withJSONObject: params, options: .prettyPrinted) // pass dictionary to nsdata object and set it as request body
} catch let error {
print(error.localizedDescription)
}
URLSession.shared.dataTask(with: urlRequest) { data, response, error in
if let error = error {
completion(nil, error)
return
}
guard let data = data else {
preconditionFailure("No error was received but we also don't have data...")
}
completion(data, nil)
}.resume()
}
}
in registrationVC how to add parameters to this function
my parameters for registration service:
struct RegData: Codable {
var jsonrpc: String
var params: PostReg
}
struct PostReg: Codable{
var email: String
var password: String
var device_id: String
}
while calling serviceCall function how to add parameters to it
if i call like this in button action
let url = "https://e/api/reg"
let jsonpostParameters: [String: Any] = RegData(jsonrpc: "2.0", params: (PostLogin(email: nameTf.text!, password: passwordTf.text!, device_id: "2")))
self.fetch(url, jsonpostParameters) { (data: Data?, error: Error?) in
guard let dt = data else { return }
// convert data to JSON
print(dt)
error:
cannot convert a value [String:Any] to RegData
how to add RegData to serviceCall, shall i change serviceCall params type? if yes how..
how add RegData to serviceCall to parse JSON

Answer 1

Kindly try this for decode data
//Here ResponceData is your codable class
let dictData = try JSONSerialization.data(withJSONObject: data, options: .prettyPrinted)
let obj= try JSONDecoder().decode([ResponseData].self, from: dictData)