---
description: API reference for AppTheme component (iOS Library)
title: AppTheme
image: https://developers.cloudflare.com/og-docs.png
---

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# AppTheme

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/realtime/realtimekit/ui-kit/api-reference/ios/app-theme/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)

The application theme singleton that provides pre-configured appearance objects for UI components. Use `AppTheme.shared` to access default appearances or call `setUp(theme:)` to apply a custom theme.

## Access

```swift
let theme = AppTheme.shared
```

## Methods

| Method                         | Return Type | Description                                           |
| ------------------------------ | ----------- | ----------------------------------------------------- |
| setUp(theme: AppThemeProtocol) | Void        | Applies a custom theme conforming to AppThemeProtocol |

## Usage Examples

### Access default theme

```swift
import RealtimeKitUI

let theme = AppTheme.shared
let titleAppearance = theme.meetingTitleAppearance
let clockAppearance = theme.clockViewAppearance
```

### Apply a custom theme

```swift
import RealtimeKitUI

class CustomTheme: AppThemeProtocol {
    // Implement required appearance properties
}

let customTheme = CustomTheme()
AppTheme.shared.setUp(theme: customTheme)
```

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