Swift 3 reusable post method in helper - ios

Question

I am working on swift 3 application and want to build login system using REST API. First I wanted a way to post data to server (PHP + MYSQL) with parameters so I found this post.
HTTP Request in Swift with POST method
Now I wanted place this code in a method as helper so I can utilise this method from anywhere in app. Hence followed this way:
Where to put reusable functions in IOS Swift?
Current code is as follow:
import Foundation
class Helper {
static func postData(resource: String, params: [String: String]) -> [String:String] {
var request = URLRequest(url: URL(string: "http://localsite.dev/api/\(resource)")!)
request.httpMethod = "POST"
var qryString: String = "?key=abcd"
for (paramKey, paramVal) in params {
qryString = qryString.appending("&\(paramKey)=\(paramVal)")
}
request.httpBody = qryString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else {
print("Error")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {
print("Error on HTTP")
return
}
let responseString = String(data: data, encoding: .utf8)
print("success and here is returned data \(responseString)")
}
task.resume()
return ["data" : "some data"]
}
}
Call this using
let loginDetails: [String: String] = ["email": emailTxt.text!, "pass": passTxt.text!]
Helper.postData(resource: "login", params: loginDetails)
In above method rather then printing data I want to return data as per below 4 conditions.
1.If error in request data then I want to return as
[“status”: false, “message”: “Something wrong with request”]
2.If error in HTTP request
[“status”: false, “message”: “Resource not found”]
3.If login fail
[“status”: false, “message”: “Wrong login details”]
4.If login success
[“status”: true, “message”: “Login success”]

Answer 1

If you want to use a third party library for handling HTTP request, I strongly recommend Alamofire.
When I wanna handle HTTP requests I usually create a singleton class:
class HttpRequestHelper {
static let shared = HttpRequestHelper()
func post(to url: URL, params: [String: String], headers: [String: String], completion: (Bool, String) -> ()){
//Make the http request
//if u got a successful response
// parse it to JSON and return it via completion handle
completion(true, message)
//if response is not successful
completion(false, message)
}
}
And you can use it everywhere:
class AnotherClass: UIViewController {
HttpRequestHelper.shared.post(to: url, params: [:], header: [:],
completion:{
success, message in
print(success)
print(message)
})
}
To the POST method more reusable and not just specific to an endpoint, I usually make the completion handler params as Bool, JSON. And then I handle the JSON response from wherever I call the method.
Oh and I use SwiftyJson to parse json, it's the simplest.