由于“内部”保护级别，初始化程序无法访问

我有一些协议

LoginStrategy

public protocol LoginStrategy { func login(_ viewController: UIViewController) func getUserInfo(withCompletionHandler completionHandler: @escaping (_ userInfo: [String: Any]?) -> ()) func createLoginButton(_ frame: CGRect, withCompletionHandler completionHandler: @escaping (_ loginButton: UIView) -> ()) func getUserId() -> String } 

和两个类：

LoginProvider

 public class LoginProvider { public let strategy: LoginStrategy public func login(_ viewController: UIViewController) { return self.strategy.login(viewController) } public func getUserInfo(withCompletionHandler completionHandler: @escaping (_ userInfo: [String: Any]?) -> ()) { return self.strategy.getUserInfo(withCompletionHandler: completionHandler) } public func createLoginButton(_ frame: CGRect, withCompletionHandler completionHandler: @escaping (_ loginButton: UIView) -> ()) { return self.strategy.createLoginButton(frame, withCompletionHandler: completionHandler) } public func getUserId() -> String { return self.strategy.getUserId() } public init(strategy: LoginStrategy) { self.strategy = strategy } } 

FacebookLoginStrategy

 import Foundation import FacebookCore import FacebookLogin public class FacebookLoginStrategy: LoginStrategy { public var grantedPermissions: Set? = nil public var declinedPermissions: Set? = nil public var userId: String = "" public func login(_ viewController: UIViewController) { let loginManager = LoginManager() let permissions: [ReadPermission] = [.publicProfile, .userFriends, .email] loginManager.logIn(permissions, viewController: viewController) { loginResult in switch loginResult { case .failed(let error): print(error) case .cancelled: print("User cancelled login.") case .success(let grantedPermissions, let declinedPermissions, let accessToken): self.userId = accessToken.userId ?? "" self.grantedPermissions = grantedPermissions self.declinedPermissions = declinedPermissions print("Logged in!") } } } public func getUserId() -> String { return userId } public func getUserInfo(withCompletionHandler completionHandler: @escaping (_ userInfo: [String: Any]?) -> ()) { let request = GraphRequest(graphPath: "me", parameters: ["fields":"email, name"], accessToken: AccessToken.current, httpMethod: .GET, apiVersion: FacebookCore.GraphAPIVersion.defaultVersion) request.start { (response, result) in switch result { case .success(let value): print(value.dictionaryValue) completionHandler(value.dictionaryValue) case .failed(let error): print(error) } } } public func createLoginButton(_ frame: CGRect, withCompletionHandler completionHandler: @escaping (_ loginButton: UIView) -> ()) { let permissions: [ReadPermission] = [.publicProfile, .userFriends, .email] let loginButton = LoginButton(readPermissions: permissions) loginButton.frame = frame completionHandler(loginButton) } } 

在我的ViewController中 ：

我用的时候：

 let facebookLoginProvider = LoginProvider(strategy: FacebookLoginStrategy()) 

它说：

由于“内部”保护级别，“FacebookLoginStrategy”无法访问

Answer 1

只需添加到您的FacebookLoginStrategy：

 public init() {} 

只要您没有显式实现init（），默认情况下它就会标记为内部。 您需要覆盖该权限级别才能从框架外部实例化。