Validating text inputs in swift

Question

My code doesn't work, can you point out whats wrong. I am trying to validate user input in SNameInput, error label should change it's text when the input is not valid and STitle should change it's text when user is done typing in SNameInput and it is valid, thanks!

func textFieldDidChange(SNameInput: UITextField) {
        let d = ""
        if (SNameInput.isEqual(d)||(SNameInput.text?.characters.count)! >= 21) {
            errorLabel.text = "Name has to be a t least 1 character and not longer than 20"}
        else{  errorLabel.text = ""
            Stitle.text = SNameInput.text}
    }

You have strange expressions like (SNameInput: UITextField) SNameInput.isEqual(d). Also, your English sentences are very difficult to understand since you don't end each sentence with the period. — El Tomato
– El Tomato, Commented Aug 6, 2017 at 3:11

Lawliet · Accepted Answer · 2017-08-06 03:10:55Z

2

Possibility: you didn't add editingDidEnd action to your SNameInput text field.

editingDidEnd: A touch ending an editing session in a UITextField object by leaving its bounds.

override func viewDidLoad() {
    super.viewDidLoad()

    SNameInput.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingDidEnd)
}

@IBAction func textFieldDidChange(_ sender: UITextField) {
    guard let string = sender.text else { return }

    if (string.isEmpty || string.characters.count >= 21) {
        errorLabel.text = "Name has to be a t least 1 character and not longer than 20"
    }
    else{
        errorLabel.text = ""
        Stitle.text = string
    }
}

answered Aug 6, 2017 at 3:10

Lawliet

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