Adaptive frame (widget) size with swiftui shape

Question

I'd like to adapt my widget's size to the widget contents overall size. The problem is, that the standard shape (background of the widget) defaults to the available space and I don't want to hardcode the frame of it. Any suggestions e.g. using GeometryReader?

struct WidgetView: View {
    var body: some View {

        ZStack {

            RoundedRectangle(cornerRadius: 40, style: .continuous)
                .foregroundColor(.gray)

            Text("TestingText")

        }
    }
}

Answer 1

I assume you wanted this

struct WidgetView: View {
    var body: some View {

        Text("TestingText")
           .background(RoundedRectangle(cornerRadius: 40, style: .continuous)
            .foregroundColor(.gray))
    }
}

Update: I think your concern is due to large corner radius that might cut some internal content.

Here is some approach

struct WidgetView<V: View>: View {   // more generic view
    var content: () -> V
    var body: some View {
        content()
           .background(RoundedRectangle(cornerRadius: 40, style: .continuous)
            .foregroundColor(.gray).padding(-20))  // compensation !!
    }
}

Testing (Xcode 11.4 / iOS 13.4)

WidgetView {
    VStack {
        Image(systemName: "car")
            .resizable().frame(width: 80, height: 80)
        Text("Some Label")
    }
}

Output