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# AVCaptureSystemZoomSlider

A control that adjusts the video zoom factor of a capture device within the system-recommended range.

```
class AVCaptureSystemZoomSlider
```

## Overview

The system sets the slider’s range to the value of the [`systemRecommendedVideoZoomRange`](/documentation/AVFoundation/AVCaptureDevice/Format/systemRecommendedVideoZoomRange) property of the device’s active format. If a device’s [`activeFormat`](/documentation/AVFoundation/AVCaptureDevice/activeFormat) value changes, the slider updates its range to the new format’s recommendation.

To use this control, add it to the capture session by calling the session’s [`addControl(_:)`](/documentation/AVFoundation/AVCaptureSession/addControl(_:)) method.

## Topics

### Creating a zoom slider

[`init(device:)`](/documentation/AVFoundation/AVCaptureSystemZoomSlider/init(device:))

Creates a slider to control the video zoom factor of a capture device.

[`init(device:action:)`](/documentation/AVFoundation/AVCaptureSystemZoomSlider/init(device:action:))

Creates a slider to control the zoom level of the specified capture device with an action to respond to zoom changes.


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