Uppercase characters in UItextfield

Question

I have a question about iOS UIKeyboard.

I have a UITextField and I would to have the keyboard with only uppercase characters.<

Answer 1

Maybe it's a bit late for an answer here, but as I have a working solution someone might find it useful.

Well, in the following textfield delegate method, check if the new string contains any lowercase characters. If so, then:

• Append the character that was just typed to the textfield's text.
• Make all the textfield's text uppercased.
• Make sure that false is returned by the method.

Otherwise just return true and let the method work as expected.

Here's its implementation:

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    var returnValue = true
    let lowercaseRange = string.rangeOfCharacter(from: CharacterSet.lowercaseLetters)
    if let _ = lowercaseRange?.isEmpty {
        returnValue = false
    }

    if !returnValue {
        textField.text = (textField.text! + string).uppercased()
    }

    return returnValue
}

The above has worked perfectly for me, and a similar implementation works for textviews too, after making the proper adjustments first of course.

Hope it helps!