问题

The storyboard looks like this
NavigationController -> HomeScreenVC -> LogInVC (modally)
When my logIn is successful I want to dismiss LogInVC and push MyAccountVC
I made a delegate to announce HomeScreenVC when LogInVC is dismissed, but my push does not work
I'll let the code below:

func logInSucceded() {
    print("delegate123")
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let viewController = storyboard.instantiateViewController(withIdentifier: "MyAccountViewController") as! MyAccountViewController
    navigationController?.pushViewController(viewController, animated: true)
}

@IBAction func loginbutton(_ sender: Any) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let viewController = storyboard.instantiateViewController(withIdentifier: "MyAccountViewController") as! MyAccountViewController
    navigationController?.pushViewController(viewController, animated: true)
}

I tried to make a direct uibutton(in HomeScreenVC) as a test if I write my push correctly and from the button it works, but logInSucceded() does not.
The print appears in console so I guess the delegate is set up correctly.
Any ideas? Thanks!

func logInSucceded() {
    print("delegate123")
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let viewController = storyboard.instantiateViewController(withIdentifier: "MyAccountViewController") as! MyAccountViewController
    navigationController?.pushViewController(viewController, animated: true)
}


@IBAction func loginbutton(_ sender: Any) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let viewController = storyboard.instantiateViewController(withIdentifier: "MyAccountViewController") as! MyAccountViewController
    navigationController?.pushViewController(viewController, animated: true)
}

答案1

得分: 1

Create a delegate protocol in your LogInVC:

在你的 LogInVC 中创建一个委托协议：

protocol LogInDelegate: AnyObject {
    func logInSucceeded()
}

In LogInVC, declare a weak delegate property:

在 LogInVC 中声明一个弱引用的委托属性：

weak var delegate: LogInDelegate?

When the login is successful, call the delegate method and dismiss LogInVC:

当登录成功时，调用委托方法并关闭 LogInVC：

func logInSucceeded() {
    delegate?.logInSucceeded()
    dismiss(animated: true, completion: nil)
}

In HomeScreenVC, conform to the LogInDelegate protocol and implement the delegate method:

在 HomeScreenVC 中，遵循 LogInDelegate 协议并实现委托方法：

extension HomeScreenVC: LogInDelegate {
    func logInSucceeded() {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let viewController = storyboard.instantiateViewController(withIdentifier: "MyAccountViewController") as! MyAccountViewController
        navigationController?.pushViewController(viewController, animated: true)
    }
}

Finally, in HomeScreenVC, when presenting the LogInVC, set HomeScreenVC as the delegate:

最后，在 HomeScreenVC 中，在呈现 LogInVC 时，将 HomeScreenVC 设置为委托：

@IBAction func loginButton(_ sender: Any) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let loginVC = storyboard.instantiateViewController(withIdentifier: "LogInViewController") as! LogInViewController
    loginVC.delegate = self
    present(loginVC, animated: true, completion: nil)
}

With this approach, when the login is successful in LogInVC, it will call the delegate method, which in turn will dismiss LogInVC and push MyAccountVC from HomeScreenVC.

protocol LogInDelegate: AnyObject {
    func logInSucceeded()
}

weak var delegate: LogInDelegate?

func logInSucceeded() {
    delegate?.logInSucceeded()
    dismiss(animated: true, completion: nil)
}

extension HomeScreenVC: LogInDelegate {
    func logInSucceeded() {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let viewController = storyboard.instantiateViewController(withIdentifier: "MyAccountViewController") as! MyAccountViewController
        navigationController?.pushViewController(viewController, animated: true)
    }
}

@IBAction func loginButton(_ sender: Any) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let loginVC = storyboard.instantiateViewController(withIdentifier: "LogInViewController") as! LogInViewController
    loginVC.delegate = self
    present(loginVC, animated: true, completion: nil)
}