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

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# RtkButton

Last updated Aug 25, 2026|Copy as Markdown|[View as Markdown](https://4f1c5cd2.previews.developers.cloudflare.com/realtime/realtimekit/ui-kit/api-reference/ios/rtk-button/index.md)|[Agent setup](https://4f1c5cd2.previews.developers.cloudflare.com/agent-setup/)

A versatile button that follows the RTK Design System. Supports multiple styles, states, and sizes.

## Initializer parameters

| Parameter      | Type                | Required | Default | Description                                           |
| -------------- | ------------------- | -------- | ------- | ----------------------------------------------------- |
| style          | Style               | ❌        | .solid  | The button style (solid, line, icon-left, and others) |
| rtkButtonState | States              | ❌        | .active | The initial state of the button                       |
| size           | Size                | ❌        | .large  | The size of the button                                |
| appearance     | RtkButtonAppearance | ❌        | \-      | Appearance configuration for colors and fonts         |

## Usage Examples

### Basic Usage

```swift
import RealtimeKitUI

let button = RtkButton()
button.setTitle("Join", for: .normal)
view.addSubview(button)
```

### With custom style

```swift
import RealtimeKitUI

let button = RtkButton(
    style: .line,
    rtkButtonState: .active,
    size: .large
)
button.setTitle("Cancel", for: .normal)
view.addSubview(button)
```

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