iOS Swift - How to add a uneditable suffix to a UITextView

How do I programmatically add a suffix ("kr") to an UITextView?

Thanks!

I assume this is when the user is typing to indicate a currency value.

In viewDidLoad assign your textview delegate (or wherever you wish to assign the delegate):

override func viewDidLoad() {
    super.viewDidLoad()
    myTextView.delegate = self
}

And then to add the suffix to the textview when user is typing

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {

    if string.characters.count > 0 {
        amountTypedString += string
        let newString = amountTypedString + "kr"
        myTextView.text = newString
    } else {
        amountTypedString = String(amountTypedString.characters.dropLast())
        if amountTypedString.characters.count > 0 {
            let newString = amountTypedString + "kr"
            myTextView.text = newString
        } else {
            myTextView.text = "0kr"
        }
    }
    return false
}