Generics Decodable And Encodable JSON

Helper4Swift/Classes/Extensions/GenericRESTClient.swift

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+//
+//  ViewController.swift
+//  GenericsDecodableAndEncodableJSON
+//
+//  Created by X901 on 11/08/2018.
+//  Copyright © 2018 X901. All rights reserved.
+//
+
+import Foundation
+
+protocol GenericRESTClient {
+    func getGenericData<T: Decodable>(urlString: String, completion: @escaping (T) -> ())
+    func postGenericData<T:Encodable>(urlString: String, parameter: T, completion: @escaping (Data?, URLResponse?, Error?) -> ())
+}
+
+extension GenericRESTClient {
+
+         func getGenericData<T: Decodable>(urlString: String, completion: @escaping (T) -> ()) {
+
+        let url = URL(string: urlString)
+        URLSession.shared.dataTask(with: url!) { (data, response, error) in
+            if let error = error {
+                print("Failed to fetch data:", error)
+                return
+            }
+
+
+            guard let data = data else { return }
+
+            do {
+                let obj = try JSONDecoder().decode(T.self, from: data)
+                completion(obj)
+            } catch let jsonErr {
+                print("Failed to decode json:", jsonErr)
+            }
+            }.resume()
+    }
+
+    func postGenericData<T:Encodable>(urlString: String, parameter: T, completion: @escaping (Data?, URLResponse?, Error?) -> ()) {
+
+        let url = URL(string: urlString)
+        var request = URLRequest(url: url!)
+        request.httpMethod = "POST"
+        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
+
+        do {
+            let jsonBody = try JSONEncoder().encode(parameter)
+
+            request.httpBody = jsonBody
+
+
+
+
+
+        } catch let jsonErr {
+            print("Failed to encode json:", jsonErr)
+        }
+
+
+        let session = URLSession.shared
+        _ = session.dataTask(with: request) { (data,response, error) in
+
+
+
+            completion(data,response, error)
+
+
+
+
+            }.resume()
+
+    }
+
+}
+
+
+
+
+
+