SOLVED: How to pass an optional Binding to a View?

@kikashi59

Aug '21

I have a view which I use in several places in the app. Some of the time, I want it to prompt for three inputs; some of the time, only for two (obviously, I'm simplifying). I want to be able to call

MyView(a: $one, b: $two, c: $three)

MyView(a: $one, c: $three)

MyView has an if {} block which controls whether it shows a request for b.

I'm tying myself in knots trying to work out how to declare MyView. Should b be @Binding var String?, or var Binding<String>?, or Binding <String?>, and how do I write the init functions?

Any help gratefully received.

Jeremy

@roosterboy HWS+

Aug '21

You can do it like this:

struct OptionalBindingView: View {
    var a: Binding<String>
    var b: Binding<String>? = nil
    var c: Binding<String>

    var body: some View {
        VStack(spacing: 20) {
            TextField("A", text: a)
            if let b = b {
                TextField("B", text: b)
            }
            TextField("C", text: c)
        }
        .textFieldStyle(RoundedBorderTextFieldStyle())
        .padding(.horizontal)
    }
}

struct ContainerView: View {
    @State private var a = ""
    @State private var b = ""
    @State private var c = ""

    var body: some View {
        VStack {
            OptionalBindingView(a: $a, b: $b, c: $c)

            Spacer()

            OptionalBindingView(a: $a, c: $c)
        }
    }
}

@kikashi59

Aug '21

On many occasions when Holmes explained how he had reached a conclusion, Watson would say "How absurdly simple", which would sometimes cause irritation.

How absurdly simple! (no irritation intended).

Thanks

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