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

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# RtkAudioButtonControlBar

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

A control bar button that toggles the local microphone on and off. Checks microphone permissions before toggling.

## Initializer parameters

| Parameter  | Type                                  | Required | Default | Description                              |
| ---------- | ------------------------------------- | -------- | ------- | ---------------------------------------- |
| meeting    | RealtimeKitClient                     | ✅        | \-      | The RealtimeKit client instance          |
| onClick    | ((RtkAudioButtonControlBar) -> Void)? | ❌        | nil     | Closure called when the button is tapped |
| appearance | RtkControlBarButtonAppearance         | ❌        | \-      | Appearance configuration for the button  |

## Usage Examples

### Basic Usage

```swift
import RealtimeKitUI

let audioButton = RtkAudioButtonControlBar(meeting: rtkClient)
view.addSubview(audioButton)
```

### With tap handler

```swift
import RealtimeKitUI

let audioButton = RtkAudioButtonControlBar(
    meeting: rtkClient,
    onClick: { button in
        print("Audio toggled")
    }
)
view.addSubview(audioButton)
```

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