CODEWITHSUNDEEP
swiftxcodeswift5
filiwonka
filiwonka

Reputation: 1

Always set "0" in UITextField if empty, even after typing something and redoing/delete

I have 5 text fields in the ViewController that I'd like to automatically be set to number "0" after deleting written numbers.

It's default set to "0" before entering numbers from the storyboard (which is correct). But after deleting written numbers, the text field is empty. I would like it to automatically be set to "0" when empty again. And not just the placeholder, but actual number.

Before entering numbers

When entering numbers

After entering numbers

Upvotes: 0

Views: 960

Answers (1)

Jay Lee
Jay Lee

Reputation: 1902

Make the view controller be the delegate of the text field, and implement the following methods:

extension ViewController: UITextFieldDelegate {
    func textFieldDidChangeSelection(_ textField: UITextField) {
        if textField.text?.isEmpty == true {
            textField.text = "0"
        }
    }

    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        if textField.text?.isEmpty == true && string.isEmpty {
            textField.text = "0"
            return false
        } else if textField.text == "0" {
            textField.text = string
            return false
        }
        return true
    }
}

If the user deletes a text entirely, the text field will show "0". If the user starts typing with the initial "0" value, the "0" will disappear and show the user-typed text.

Edit: To set a view controller a delegate of the text field, right click (or ctrl + click) and drag from the textfield to the view controller in the storyboard:

storyboard

and choose delegate:

delegate

If you are not using a storyboard or don't want to use it, you can always do it programmatically.

    override func viewDidLoad() {
        super.viewDidLoad()

        textField.delegate = self
    }

Upvotes: 3

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