How to create SwiftUI TextField that accepts only numbers and a single dot?

Question

How to create a swiftui textfield that allows the user to only input numbers and a single dot? In other words, it checks digit by digit as the user inputs, if the input is a

Answer 1

This is a simple solution for TextField validation: (updated)

struct ContentView: View {
@State private var text = ""

func validate() -> Binding {
    let acceptableNumbers: String = "0987654321."
    return Binding(
        get: {
            return self.text
    }) {
        if CharacterSet(charactersIn: acceptableNumbers).isSuperset(of: CharacterSet(charactersIn: $0)) {
            print("Valid String")
            self.text = $0
        } else {
            print("Invalid String")
            self.text = $0
            self.text = ""
        }
    }
}

var body: some View {
    VStack {
        Spacer()
        TextField("Text", text: validate())
            .padding(24)
        Spacer()
    }
  }
}