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

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# RtkAudioButtonControlBar

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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