Type 'NSNotification.Name' has no member 'UITextField'

With Swift 4.2, getting following error, that was working fine with Swift 4.

Type 'NSNotification.Name' has no member 'UITextField'

Here is my error code.

NotificationCenter.default.addObserver(forName: NSNotification.Name.UITextField.textDidChangeNotification, object: textField, queue: OperationQueue.main) (notification) in
loginAction.isEnabled = textField.text != ""



Full Code:

@IBAction func alertWithLogin()

let alertController = UIAlertController(title: "Please Enter Credential", message: nil, preferredStyle: .alert)

// ADD ACTIONS HANDLER
let loginAction = UIAlertAction(title: "Login", style: .default) (_) in

let loginTextField = alertController.textFields![0] as UITextField
let passwordTextField = alertController.textFields![1] as UITextField

// do something with after login

loginAction.isEnabled = false
alertController.addAction(loginAction)

let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) (_) in
// do something

alertController.addAction(cancelAction)

// ADD TEXT FIELDS
alertController.addTextField (textField) in
textField.placeholder = "Email"

alertController.addTextField (textField) in
textField.placeholder = "Password"
textField.isSecureTextEntry = true

// enable login button when password is entered
NotificationCenter.default.addObserver(forName: NSNotification.Name.UITextField.textDidChangeNotification, object: textField, queue: OperationQueue.main) (notification) in
loginAction.isEnabled = textField.text != ""



// PRESENT
present(alertController, animated: true)



3 Answers
3

textDidChangeNotification is a member of UITextField (and UITextView).

textDidChangeNotification

UITextField

UITextView

NotificationCenter.default.addObserver(
self,
selector: #selector(self.keyboardDidShow(notification:)),
name: UITextField.textDidChangeNotification,
object: nil)


NotificationCenter.default.addObserver(forName: Notification.Name.UITextFieldTextDidChange, object: textField, queue: OperationQueue.main) (notification) in
//...



In swift sdk, All notification name should be the extension of struct: Notification.Name

So when use Notification.Name, you should ignore Class name(exc.UITextField), input "Notification.Name." then input some of your name(like "TextF") and use esc to show autocomplete

Notification.Name.UITextFieldTextDidChange

Notification.Name

When Migrating to 4.2 -

NSNotification.Name.UITextFieldTextDidEndEditing

NSNotification.Name.UITextFieldTextDidBeginEditing

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