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...
List out what is the control transfer statements used in swift Control flow statements are used to control the flow of execution in a program. There are several types of control flow statements in Swift, including loop statements, branch statements, and control transfer statements. 1. Loop statements allow a block of code to be executed repeatedly 2. Branch statements allow a certain block of code to be executed only when certain conditions are met 3. Control transfer statements provide a way to alter the order in which code is executed. 4. Swift provides a do statement to introduce scope, and catch and handle errors, 5. Defer statement for running cleanup actions just before the current scope exits. Loop Statements - Loop statements allow a block of...