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

In SwiftUI, you may want to use Combine framework to do this. Create an ObservableObject to handle value changes. Example code here:

import SwiftUI
import Combine

struct ContentView: View {

    class ViewModel: ObservableObject {
        @Published var text = "" {
            didSet {
                if text.prefix(1) != "+" {
                    text = "+" + text
                }
            }
        }
    }

    @ObservedObject var viewModel = ViewModel()

    var body: some View {
        TextField("Placeholder", text:$viewModel.text)
    }
}