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...
An Enum & Enumeration consists of integral constants " An enumeration is a user-define data type which consists of a set of related value" Is used to define enum keyword" enum type { const1, const2, const3, .......} enum week { case Monday case Tuesday ..... case Sunday } Swift Example :- enum Country { case India case America case Russia case Chaina } var power = Country.America power = .America switch power { case .India: print("India Country is No 4") case .America: print("America Country is No 1") case . Russia: print("Russia Country is No 2") case . Chaina: print("Chaina Country is No 3") } ...