import Foundation import KeychainAccess enum APIError : Error { case accessTokenExpired case networkError // Add more error cases as needed } class APIManager { private let keychain = Keychain (service: "com.example.app.refreshToken" ) private let refreshTokenKey = "refreshToken" private var accessToken: String ? func callAPI < T : Codable >( urlString : String , method : String , parameters : [ String : Any ] ? , completion : @escaping ( Result < T , APIError >) -> Void ) { guard let url = URL (string: urlString) else { completion(.failure(.networkError)) return } var request = URLRequest (url: url) request.httpMethod = method // Add access token to the request headers if available if let token = accessToken { request.setValue( "Bearer \(token) " , forHTTPHeaderField: "Aut...
Core Data - Core Data is a framework that you use to manage the data model layer objects or instance Context in your application. It provides generalized and automated data stores solutions to common tasks associated with object life cycle and object graph management, including persistence. Completely Tutorial for Swift 4 and iOS 11. Gating Start Goto Xcode and create New iOS Project on single view. Project Name CoreDataSwift or Checked Use Core Data On click Main.Storyboard in Interface builder click on project navigation Editor - Embed In - Navigation controller. Then After click on Navigation ViewController and next Drag TableView in to ViewController. Make TableView viewcontroller Outlet Delegate, DataSource and import CoreData import UIKit import CoreData class ViewController: UIViewController , UITableViewDataSource , UITableViewDelegate { override func viewDidLoad() { ...