---
title: theme
framework: appintents
role: symbol
role_heading: Instance Property
path: appintents/assistantschemas/booksenum/theme
---

# theme

The theme for rendering a book.

## Declaration

```swift
var theme: some AssistantSchemas.Enum { get }
```

## Overview

Overview Use Swift macros that generate additional properties and add protocol conformance for your app enum implementation. The following example shows an app enum that conforms to the .books.theme schema: @AppEnum(schema: .books.theme) enum BookTheme: AppEnum {     case lightMode     case darkMode     case theme1

static var caseDisplayRepresentations: [BookTheme: AppIntents.DisplayRepresentation] = [         .lightMode: "Light Mode",         .darkMode: "Dark Mode",         .theme1: "Theme 1",     ] } For more information about the .books app intent domain, see doc:Making-ebook-actions-available-to-siri-and-apple-intelligence. For general information about app intent domains, see doc:Integrating-actions-with-siri-and-apple-intelligence.