关于Swift：iOS无法关闭视图控制器

iOS Can't dismiss view controller

我的应用程序有问题。场景很简单，成功创建帐户后，我将不会关闭当前页面或导航至登录页面。我的故事板如下所示：

enter image description here

成功创建帐户后，我会弹出一个对话框，其中包含一些可以的信息，我们将向您发送验证电子邮件，此弹出窗口之后，我想转到页面的第二左-这是我的主应用程序页面(现称为" View Controller")。

我尝试关闭窗口，但是在那里没有任何效果，它只能关闭弹出窗口。
当我尝试重定向时，当按下后退按钮时出现问题，这将导致"注册"页面。有一些代码：

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// Create new user and send verification email

Auth.auth().createUser(withEmail: userEmail, password: userPassword) { user, error in if error == nil && user != nil {
self.sendVerificationMail();
self.displayAlertMessage(alertTitle:"Success", alertMessage:"Your account created successfully. We send you a verification email.");

// Redirect to View Controller

} else {
self.displayAlertMessage(alertTitle:"Unhandled error", alertMessage:"Undefined error #SignUpViewController_0002");
}
}

...

func displayAlertMessage(alertTitle: String, alertMessage:String, alertRedirection:String =""){
let alert = UIAlertController(title: alertTitle, message: alertMessage, preferredStyle: UIAlertController.Style.alert);

let okAction = UIAlertAction(title:"Ok", style: UIAlertAction.Style.default, handler: nil);

alert.addAction(okAction);

self.present(alert, animated:true, completion:nil);
}

如果我添加此：

self.view.window！.rootViewController？.dismiss(动画：false，完成：nil)

警报后，仅关闭警报，警报前不执行任何操作(与关闭相同)。

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查看控制器类：

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import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
super.viewDidLoad()
}

override func viewDidAppear(_ animated: Bool) {
self.performSegue(withIdentifier:"notLoggedView", sender: self);
}
}

班级ID设置为"测试"：

enter image description here

"推"：

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...
let storyboard = UIStoryboard(name:"Main", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier:"test") as ViewController
navigationController?.pushViewController(vc, animated: true)
...

和可悲的错误：

'UIViewController' is not convertible to 'ViewController'

我在哪里弄错了？

好吧，您正在使用导航控制器，例如，要"呈现"一个新的视图控制器，您需要对其进行推送。

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let storyboard = UIStoryboard(name:"Main", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier("IDOFYOURVIEW") as CLASS_NAME_OFYOUR_VIEWCONTROLLER
navigationController?.pushViewController(vc, animated: true)

使用最后的代码，您可以"呈现"(推动)新的视图控制器

现在，如果您想在按下后退按钮时执行其他操作，请尝试使用此行

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override func viewDidLoad {
super.viewDidLoad()
self.navigationItem.hidesBackButton = true
let newBackButton = UIBarButtonItem(title:"Back", style: UIBarButtonItemStyle.Bordered, target: self, action:"back:")
self.navigationItem.leftBarButtonItem = newBackButton
}

func back(sender: UIBarButtonItem) {
//in this part you can move to other view controller, examples
// Go back specific view in your navigation controller
for controller in self.navigationController!.viewControllers as Array {
if controller.isKind(of: NAMECLASS_OFYOUR_VIEWCONTROLLER.self) {
_ = self.navigationController!.popToViewController(controller, animated: true)
break
}
}
// Perform your custom actions
// ...
// Go back to the previous ViewController
self.navigationController?.popViewControllerAnimated(true)
}

问候