how to bind to both nullable and nonnullable values in swiftui - swiftui

Question

I have the following view, which works fine:
struct Decimal_text_field_nullable : View {
#State var name : String
#State var place_holder : String
#Binding var value : Double?
var format_as_decimal: NumberFormatter {
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
return formatter
}
var body: some View {
VStack(alignment: .leading) {
Text(name)
.font(.headline)
TextField( place_holder, value : $value, formatter: format_as_decimal )
.add_close_button()
.keyboardType(.decimalPad)
.padding(.all)
.background(Color(red: 239.0/255.0, green: 243.0/255.0, blue: 244.0/255.0, opacity: 0.2))
}
.padding(.horizontal, 15)
}
however I have to have a Decimal_text_field_nullable and a Decimal_text_field with exactly the same code except for a question mark on the definition of value - because I can't bind a Double value to a Double? value.
Is there any way to make a decimal_text_field where this can work:
VStack()
{
Decimal_text_field("non optional value", value = $non_nullable_double )
Decimal_text_field("optional_value", value = $nullable_double )
}

Answer 1

You can use this approach for both bindings. This code used for both.
struct Decimal_text_field: View {
#State private var name: String
#State private var place_holder: String
#Binding private var value: Double?
init(name : String, place_holder : String, value : Binding<Double?>) {
self.name = name
self.place_holder = place_holder
self._value = value
}
init(name : String, place_holder : String, value : Binding<Double>) {
self.name = name
self.place_holder = place_holder
self._value = Binding(get: {Optional(value.wrappedValue)}, set: {value.wrappedValue = $0 ?? 0})
}
var format_as_decimal: NumberFormatter {
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
return formatter
}
}
Note: Try to avoid under score on the var name and struct name.