View Builder Example modifier.swift

struct ShadowBorderModifier: ViewModifier {
    func body(content: Content) -> some View {
        content
            .border(Color.black, width: 1)
            .shadow(radius: 5)
    }
}

extension View {
    func dropShadow() -> some View {
        ModifiedContent(content: self, modifier: ShadowBorderModifier())
    }
}

// Call the modifier on any View
Text("Hello, world!")
    .dropShadow()