Add a prefix to TextField in SwiftUI

Question

I want a ‘+’ Sign in the Textfield which cannot be erased. A user should be able to enter values after it and if he presses backspace it should only erase the v

Answer 1

Try replacing the "+" with my "kg"

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        var amountTypedString = myTF.text
        if string.count > 0 {
            if amountTypedString?.count ?? 0 > 2 {
                amountTypedString = String((amountTypedString?.dropLast(2))!)
            }
            amountTypedString! += string
            let newString = amountTypedString! + "kg"
            myTF.text = newString
        } else {
            amountTypedString = String((amountTypedString?.dropLast(3))!)
            if (amountTypedString?.count)! > 0 {
                let newString = amountTypedString! + "kg"
                myTF.text = newString
            } else {
                myTF.text = ""
            }
        }
        return false
    }