ViewController关闭swift ios

你好，我的英语不是很好，我提前道歉

我的申请有问题。场景如下：我将我的rootViewController分配给我的ViewController，这是我的开始。我还有其他的屏幕，是一个描述屏幕，我有两个登录和注册按钮，当预加载时会将我带到他们的控制器

现在，当我在日志全屏窗体上发送解雇命令时：

视图控制器注册

self.dismiss(animated: false, completion: nil)

所有正常视图都是隐藏的，但当进入前一个屏幕（即描述）时，如果已经有用户，我会进行验证，如果有解雇命令：

ViewController描述应用程序

self.dismiss(animated: false, completion: nil)

但它不执行该操作

代码

UIViewController

class ViewController: UIViewController {

    override func viewDidLoad() {

        FIRAuth.auth()!.addStateDidChangeListener() { auth, user in
            if user == nil {
                let descriptionController = DescriptionController()
                present(descriptionController, animated: true, completion: nil)
            }

        }
    }
}

class DescriptionController: UIViewController {

    @IBOutlet weak var sign_in_custom: UIButton!

    override func viewDidLoad() {

        FIRAuth.auth()!.addStateDidChangeListener() { auth, user in
            if user != nil {
               self.dismiss(animated: false, completion: nil)
            }

        }

        sign_in_custom.addTarget(self, action: #selector(changeToSingIn), for: [.touchUpInside])
    }

    func changeToSingIn() {
        let singInController = SingInController()
        present(singInController, animated: true, completion: nil)
    }
}

class SingInController: UIViewController {
    @IBOutlet weak var sign_in_custom: UIButton!
    override func viewDidLoad() {
        sign_in_custom.addTarget(self, action: #selector(singIn), for: [.touchUpInside])
    }
    func showLoad() {
        let alert = UIAlertController(title: nil, message: "Please wait...", preferredStyle: .alert)
        alert.view.tintColor = UIColor.black
        let loadingIndicator: UIActivityIndicatorView = UIActivityIndicatorView(frame: CGRectMake(10, 5, 50, 50) ) as UIActivityIndicatorView
        loadingIndicator.hidesWhenStopped = true
        loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
        loadingIndicator.startAnimating();
        alert.view.addSubview(loadingIndicator)
        present(alert, animated: true, completion: nil)
    }
    func hideLoad() {
        self.dismiss(animated: false, completion: nil)
    }
    func singIn() {
        if (emailVarification()){
            if (passwordVarification()){
                showLoad()
                guard let email = emailTextField.text else { return }
                guard let password = passwordTextField.text else { return }
                FIRAuth.auth()?.createUser(withEmail: email, password: password) { (user, error) in
                    hideLoad()
                    if (user != nil) {
                        self.dismiss(animated: false, completion: nil)
                    } else {
                        let alert = UIAlertController(title: "Error", message: "This is a error", preferredStyle: UIAlertControllerStyle.alert)
                        alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
                        self.present(alert, animated: true, completion: nil)
                    }
                }
            } else {
                let alert = UIAlertController(title: "Error", message: "This is a error", preferredStyle: UIAlertControllerStyle.alert)
                alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
                self.present(alert, animated: true, completion: nil)
            }
        } else {
            let alert = UIAlertController(title: "Error", message: "This is a error", preferredStyle: UIAlertControllerStyle.alert)
            alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
            self.present(alert, animated: true, completion: nil)
        }
    }
}

描述控制器

class ViewController: UIViewController {

    override func viewDidLoad() {

        FIRAuth.auth()!.addStateDidChangeListener() { auth, user in
            if user == nil {
                let descriptionController = DescriptionController()
                present(descriptionController, animated: true, completion: nil)
            }

        }
    }
}

class DescriptionController: UIViewController {

    @IBOutlet weak var sign_in_custom: UIButton!

    override func viewDidLoad() {

        FIRAuth.auth()!.addStateDidChangeListener() { auth, user in
            if user != nil {
               self.dismiss(animated: false, completion: nil)
            }

        }

        sign_in_custom.addTarget(self, action: #selector(changeToSingIn), for: [.touchUpInside])
    }

    func changeToSingIn() {
        let singInController = SingInController()
        present(singInController, animated: true, completion: nil)
    }
}

class SingInController: UIViewController {
    @IBOutlet weak var sign_in_custom: UIButton!
    override func viewDidLoad() {
        sign_in_custom.addTarget(self, action: #selector(singIn), for: [.touchUpInside])
    }
    func showLoad() {
        let alert = UIAlertController(title: nil, message: "Please wait...", preferredStyle: .alert)
        alert.view.tintColor = UIColor.black
        let loadingIndicator: UIActivityIndicatorView = UIActivityIndicatorView(frame: CGRectMake(10, 5, 50, 50) ) as UIActivityIndicatorView
        loadingIndicator.hidesWhenStopped = true
        loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
        loadingIndicator.startAnimating();
        alert.view.addSubview(loadingIndicator)
        present(alert, animated: true, completion: nil)
    }
    func hideLoad() {
        self.dismiss(animated: false, completion: nil)
    }
    func singIn() {
        if (emailVarification()){
            if (passwordVarification()){
                showLoad()
                guard let email = emailTextField.text else { return }
                guard let password = passwordTextField.text else { return }
                FIRAuth.auth()?.createUser(withEmail: email, password: password) { (user, error) in
                    hideLoad()
                    if (user != nil) {
                        self.dismiss(animated: false, completion: nil)
                    } else {
                        let alert = UIAlertController(title: "Error", message: "This is a error", preferredStyle: UIAlertControllerStyle.alert)
                        alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
                        self.present(alert, animated: true, completion: nil)
                    }
                }
            } else {
                let alert = UIAlertController(title: "Error", message: "This is a error", preferredStyle: UIAlertControllerStyle.alert)
                alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
                self.present(alert, animated: true, completion: nil)
            }
        } else {
            let alert = UIAlertController(title: "Error", message: "This is a error", preferredStyle: UIAlertControllerStyle.alert)
            alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
            self.present(alert, animated: true, completion: nil)
        }
    }
}

辛格勒

class ViewController: UIViewController {

    override func viewDidLoad() {

        FIRAuth.auth()!.addStateDidChangeListener() { auth, user in
            if user == nil {
                let descriptionController = DescriptionController()
                present(descriptionController, animated: true, completion: nil)
            }

        }
    }
}

class DescriptionController: UIViewController {

    @IBOutlet weak var sign_in_custom: UIButton!

    override func viewDidLoad() {

        FIRAuth.auth()!.addStateDidChangeListener() { auth, user in
            if user != nil {
               self.dismiss(animated: false, completion: nil)
            }

        }

        sign_in_custom.addTarget(self, action: #selector(changeToSingIn), for: [.touchUpInside])
    }

    func changeToSingIn() {
        let singInController = SingInController()
        present(singInController, animated: true, completion: nil)
    }
}

class SingInController: UIViewController {
    @IBOutlet weak var sign_in_custom: UIButton!
    override func viewDidLoad() {
        sign_in_custom.addTarget(self, action: #selector(singIn), for: [.touchUpInside])
    }
    func showLoad() {
        let alert = UIAlertController(title: nil, message: "Please wait...", preferredStyle: .alert)
        alert.view.tintColor = UIColor.black
        let loadingIndicator: UIActivityIndicatorView = UIActivityIndicatorView(frame: CGRectMake(10, 5, 50, 50) ) as UIActivityIndicatorView
        loadingIndicator.hidesWhenStopped = true
        loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
        loadingIndicator.startAnimating();
        alert.view.addSubview(loadingIndicator)
        present(alert, animated: true, completion: nil)
    }
    func hideLoad() {
        self.dismiss(animated: false, completion: nil)
    }
    func singIn() {
        if (emailVarification()){
            if (passwordVarification()){
                showLoad()
                guard let email = emailTextField.text else { return }
                guard let password = passwordTextField.text else { return }
                FIRAuth.auth()?.createUser(withEmail: email, password: password) { (user, error) in
                    hideLoad()
                    if (user != nil) {
                        self.dismiss(animated: false, completion: nil)
                    } else {
                        let alert = UIAlertController(title: "Error", message: "This is a error", preferredStyle: UIAlertControllerStyle.alert)
                        alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
                        self.present(alert, animated: true, completion: nil)
                    }
                }
            } else {
                let alert = UIAlertController(title: "Error", message: "This is a error", preferredStyle: UIAlertControllerStyle.alert)
                alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
                self.present(alert, animated: true, completion: nil)
            }
        } else {
            let alert = UIAlertController(title: "Error", message: "This is a error", preferredStyle: UIAlertControllerStyle.alert)
            alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
            self.present(alert, animated: true, completion: nil)
        }
    }
}

---

在视图中使用此代码显示：

FIRAuth.auth()!.addStateDidChangeListener() { auth, user in
        if user != nil {
           self.dismiss(animated: false, completion: nil)
        }

    }

    sign_in_custom.addTarget(self, action: #selector(changeToSingIn), for: [.touchUpInside])

---

与其让DescriptionController自行关闭，更好的方法是通知ViewController用户已登录，并在必要时返回任何错误。然后，ViewController可以根据登录成功或失败执行所需的任何其他步骤。这可以通过使用委托模式实现（DescriptionController定义协议，ViewController实现协议）

这是因为第二个控制器基本上刚刚放置在现有控制器的顶部。第一个视图仍在第二个视图下运行，当第二个视图关闭时，第一个视图不会调用ViewDidLoad。因此，要解决这个问题，您可能需要将它添加到ViewDidDisplay函数中