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# AVCaptureSystemExposureBiasSlider

A control that adjusts the exposure bias of a capture device within the system-recommended range.

```
class AVCaptureSystemExposureBiasSlider
```

## Overview

This control defines its range by querying the [`systemRecommendedExposureBiasRange`](/documentation/AVFoundation/AVCaptureDevice/Format/systemRecommendedExposureBiasRange) property of the device’s active format. If a device’s [`activeFormat`](/documentation/AVFoundation/AVCaptureDevice/activeFormat) value changes, the slider updates its range with the new format’s system-recommended value.

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

## Topics

### Creating an exposure bias slider

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

Creates a slider to control the exposure bias of the specified capture device.

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

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


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