asked on

TextField Changed Notification Problem

I am trying to run code in swift when a textField (in macOS) changes. I have tried:

override func viewDidLoad() {
super.viewDidLoad()

let name = "NSNotificationTextFieldChanged"
NotificationCenter.default.addObserver(self, selector: Selector(fieldTextDidChange),
Notification(name: Notification.Name(rawValue: name)), object: nil)

}

func fieldTextDidChange(notification: NSNotification) {
errorMessage.stringValue = ""
errorMessage.isHidden = true
}

but I get the error "Cannot convert value of type '(NSNotification) -> ()' to expected argument type 'String'

Any ideas?

Hamidreza Vakilian

I don't think adding observers is the proper way. Try this way:

Swift:

textField.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged)

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and

 func textFieldDidChange(textField: UITextField) {
    //your code
}

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Swift 2.2:

textField.addTarget(self, action: #selector(YourViewController.textFieldDidChange(_:)), forControlEvents: UIControlEvents.EditingChanged)

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and

func textFieldDidChange(textField: UITextField) {
    //your code
}

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Swift 3:

textField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged)

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and

func textFieldDidChange(_ textField: UITextField) {
//do something here
}

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STEVEN WEBBER

ASKER

Thanks Hamidreza Vakilian. I will try this.

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