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

Swift 4.0 Version:

First set the delegate for the textfield you want to uppercase to the current ViewController (click drag from the textfield to the currentViewController to set the delegate).

After add the extension:

extension CurrentViewController: UITextFieldDelegate{

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

        //refference to the textfield you want to target
        if textField.tag == 5{
            textField.text = (textField.text! as NSString).replacingCharacters(in: range, with: string.uppercased())
            return false
        }
        return true
    }
}