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# customVirtioDeviceWillStop(_:)

The method the framework calls when a device will be stopped.

```
optional func customVirtioDeviceWillStop(_ device: VZCustomVirtioDevice)
```

## Parameters

`device`

The device invoking the delegate method.

## Discussion

A device is in a stopped state when its corresponding [`VZVirtualMachine`](/documentation/Virtualization/VZVirtualMachine) has stopped. This can happen when the guest performs a shutdown operation itself,  or when you call [`requestStop()`](/documentation/Virtualization/VZVirtualMachine/requestStop()).

---

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