Detect if custom UITextField has a text value

Question

I created a custom text field, a class that extends a UITextField, how can I know if that UITextField has a value, I already tried the shouldChangeCharactersIn but nothing happened.

This is my code for my custom UITextField Class

@IBDesignable class CustomTextField: UITextField {
    override init(frame: CGRect) {
        super.init(frame: frame)
        loadContent()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        loadContent()
    }
    ...
}

I want to print "the textfield is blank" if the UITextField is blank or if the user removed the value in it, and "the textfield has content" if there's a value in it or if the user add a value in it.

Leo Dabus · Accepted Answer · 2020-04-23 06:14:22Z

1

You just need to add a target to your text field for UIControl.Event .editingChanged

override func willMove(toSuperview newSuperview: UIView?) {
    addTarget(self, action: #selector(editingChanged), for: .editingChanged)
}

And use UIKeyInput method hasText to check if your field is empty or not:

@objc func editingChanged(_ textField: UITextField) {
    print("the textfield " + (hasText ? "has content" : "is blank"))
}

edited Apr 23, 2020 at 6:14

answered Apr 23, 2020 at 5:57

Leo Dabus

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3 Comments

Dylan Over a year ago

I tried adding the addTarget(self, action: #selector(editingChanged), for: .editingChanged) inside override init(frame: CGRect) but it doesn't print anything whenever I add or removed the text in the textfield

Leo Dabus Over a year ago

I would override willMoveToSuperview instead of overriding its init method

Dylan Over a year ago

willMove(toSuperview newSuperview: UIView?) worked for me

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