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

Question

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)
}

score 53 · Accepted Answer · answered Sep 14 '18 at 05:41

53

textDidChangeNotification is a member of UITextField (and UITextView).

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

answered Sep 14 '18 at 05:41

rmaddy

314,917
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1

I was coming here next :D It seems like they moved all the notifications to their respective classes. – Rakesha Shastri Sep 14 '18 at 05:44
1

Worked for me in Swift 4.2 Thanks Buddy!! – Ravi Oct 03 '18 at 08:18

score 6 · Answer 2 · answered Jun 27 '19 at 10:10

I faced the same problem,

Here is the simplest solution:

Instead of using forName: NSNotification.Name.UITextField.textDidChangeNotification

Use like this in forName: Parameter:

NotificationCenter.default.addObserver(forName: UITextField.textDidChangeNotification, object: textField, queue: OperationQueue.main) { (notification) in
//Your code goes here...
        }

score 1 · Answer 3 · answered Sep 14 '18 at 09:00

1

        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

answered Sep 14 '18 at 09:00

Sven Shao

45
4

1

There is no such thing as `Notification.Name.UITextFieldTextDidChange` (at least as of Swift 4.2). Most notifications are *not* under `Notification.Name` (again, at least as of Swift 4.2). – rmaddy Jan 06 '19 at 17:56

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

3 Answers3

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