// ViewController の cancelReloadingUser ボタンを押すと // reloadUser ボタンで実行されている User のリロードを // キャンセルするように ViewController の実装を完成させて下さい。 import Foundation import FoundationNetworking class UIViewController {} final class UIButton {} final class UILabel { var text: String? } struct User: Identifiable, Codable { typealias ID = Int let id: ID var name: String var thumbnailURL: URL } func fetchUser(for id: User.ID) async throws -> User { let url: URL = URL(string: "https://koherent.org/async-await-challenge/api/user?id=\(id.description)")! let data: Data = try Data(contentsOf: url) let user: User = try JSONDecoder().decode(User.self, from: data) return user } // 🚧 このクラスを完成させる final class ViewController: UIViewController { let reloadUserButton: UIButton = .init() let cancelReloadingUserButton: UIButton = .init() let userNameLabel: UILabel = .init() @asyncHandler func onReloadUserButtonPressed(_ sender: UIButton) { if let user = try? await fetchUser(for: 123) { userNameLabel.text = user.name } } func onCancelReloadingUserButtonPressed(_ sender: UIButton) { } } let viewController: ViewController = .init() viewController.onReloadUserButtonPressed(viewController.reloadUserButton) viewController.onCancelReloadingUserButtonPressed(viewController.cancelReloadingUserButton)