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# virtualDeviceConstituentPhotoDeliveryEnabledDevices

The constituent devices for which the virtual device should deliver photos.

```
var virtualDeviceConstituentPhotoDeliveryEnabledDevices: [AVCaptureDevice] { get set }
```

## Discussion

You can opt in to constituent-device photo delivery by setting this property to any subset of the devices in the virtual device’s [`constituentDevices`](/documentation/AVFoundation/AVCaptureDevice/constituentDevices) array. The framework calls your [`photoOutput(_:didFinishProcessingPhoto:error:)`](/documentation/AVFoundation/AVCapturePhotoCaptureDelegate/photoOutput(_:didFinishProcessingPhoto:error:))callback once for each of the devices you include in the array.

You may only set this property to a non-`nil` array if you’ve set your photo output’s [`isVirtualDeviceConstituentPhotoDeliveryEnabled`](/documentation/AVFoundation/AVCapturePhotoOutput/isVirtualDeviceConstituentPhotoDeliveryEnabled) property to <doc://com.apple.documentation/documentation/Swift/true>, and your delegate implements the [`photoOutput(_:didFinishProcessingPhoto:error:)`](/documentation/AVFoundation/AVCapturePhotoCaptureDelegate/photoOutput(_:didFinishProcessingPhoto:error:)) method.

The default value of this property is an empty array.

---

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