管理委托出的UIViewController类

Question

我想了解实现委托出UIViewController类的最佳方法是什么

如何使用AuthManager中函数的AuthManager参数管理委托？

这是我工作的两个班..。我给你举一些小例子，让你明白

 class StartController: UIViewController {

    @objc private func presentAuthFacebookController() {
        AuthManager.signInWithFacebook(controller: self)
    }
}

class AuthManager {
static func signInWithFacebook(controller: UIViewController) {

    let loginManager = LoginManager()
    loginManager.logIn(permissions: [.publicProfile, .email], viewController: controller) { (result) in

        switch result {
        case .cancelled : print("\n AuthFacebook: operazione annullata dall'utente \n")
        case .failed(let error) : print("\n AuthFacebook: \(error) \n")
        case .success(granted: _, declined: let declinedPermission, token: _):


            let authVC = ExistingEmailController()

            authVC.delegate = // ?????? (controller)

            UIApplication.shared.windows.first?.rootViewController?.present(authVC, animated: true, completion: nil)
        }
    }
}
}

Answer 1

我个人认为StartController不应该知道/遵守ExistingEmailControllerDelegate。但是，如果确实需要，可以将controller声明为组合类型：

static func signInWithFacebook(controller: UIViewController & ExistingEmailControllerDelegate) {
    ...
    authVC.delegate = controller

在我看来，拥有AuthManager的全部意义是在ExistingEmailController之上创建抽象层，并封装身份验证的逻辑。因此，StartController不应该知道，也不应该关心ExistingEmailControllerDelegate。它只知道AuthManager。

AuthManager应该是ExistingEmailController的委托，这意味着signInWithFacebook不应该是静态的，AuthManager可以有一个StartController符合的AuthManagerDelegate：

class AuthManager : ExistingEmailControllerDelegate {
    weak var delegate: AuthManagerDelegate?

    func signInWithFacebook(controller: UIViewController) {

        ...

        let authVC = ExistingEmailController()

        authVC.delegate = self

        UIApplication.shared.windows.first?.rootViewController?.present(authVC, animated: true, completion: nil)
    }

    func someMethodFromExistingEmailControllerDelegate() {
        delegate?.someMethod() // delegating it self.delegate, which StartController conforms to
    }
}

protocol AuthManagerDelegate : class {
    func someMethod()
}

 class StartController: UIViewController, AuthManagerDelegate {

    var authManager: AuthManager!

    override func viewDidLoad() {
        authManager = AuthManager()
        authManager.delegate = self
    }

    @objc private func presentAuthFacebookController() {
        authManager.signInWithFacebook(controller: self)
    }

    func someMethod() {
        // write here the code that you would have written in someMethodFromExistingEmailControllerDelegate
    }
}