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# init(device:)

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

```
init(device: AVCaptureDevice)
```

## Parameters

`device`

The capture device to control.

## Discussion

You can only create an exposure bias slider with a device that support’s setting its [`exposureTargetBias`](/documentation/AVFoundation/AVCaptureDevice/exposureTargetBias) property value.

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