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

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# RtkStageActionButtonControlBar

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/rtk-stage-action-button-control-bar/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)

A control bar button for webinar stage actions. Supports requesting to join, joining, leaving, and canceling stage requests based on the current stage status.

## Initializer parameters

| Parameter                | Type               | Required | Default | Description                                                |
| ------------------------ | ------------------ | -------- | ------- | ---------------------------------------------------------- |
| rtkClient                | RealtimeKitClient  | ✅        | \-      | The RealtimeKit client instance                            |
| buttonState              | WebinarStageStatus | ✅        | \-      | The current stage status that determines the button action |
| presentingViewController | UIViewController   | ✅        | \-      | View controller used for presenting confirmation dialogs   |

## Properties

| Property   | Type                                      | Required | Default | Description                                              |
| ---------- | ----------------------------------------- | -------- | ------- | -------------------------------------------------------- |
| dataSource | RtkStageActionButtonControlBarDataSource? | ❌        | nil     | Data source for customizing stage action button behavior |

## Usage Examples

### Basic Usage

```swift
import RealtimeKitUI

let stageButton = RtkStageActionButtonControlBar(
    rtkClient: rtkClient,
    buttonState: .requestToJoinStage,
    presentingViewController: self
)
view.addSubview(stageButton)
```

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