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

normally you should post your coding tries here, because this is not a "we code for you"-platform....but...it is a sunny day so here is the code ;)

override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.

        let textField = UITextField(frame: CGRect(x: 100, y: 100, width: 200, height: 20))
        view.addSubview(textField)

        textField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: UIControl.Event.editingChanged)

        textField.layer.borderColor = UIColor.red.cgColor
        textField.layer.borderWidth = 2

    }

    @objc func textFieldDidChange(_ textField: UITextField) {

        if textField.text?.prefix(1) != "+" {
            textField.text = "+" + textField.text!
        }
    }