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# VZVirtualMachineDelegate

The methods you use to respond to changes in the state of the VM.

```
protocol VZVirtualMachineDelegate : NSObjectProtocol
```

## Topics

### Stopping the VM

[`guestDidStop(_:)`](/documentation/Virtualization/VZVirtualMachineDelegate/guestDidStop(_:))

Tells the delegate that the guest operating system stopped the VM.

[`virtualMachine(_:didStopWithError:)`](/documentation/Virtualization/VZVirtualMachineDelegate/virtualMachine(_:didStopWithError:))

Tells the delegate that the VM stopped because of an error.

### Responding to network device errors

[`virtualMachine(_:networkDevice:attachmentWasDisconnectedWithError:)`](/documentation/Virtualization/VZVirtualMachineDelegate/virtualMachine(_:networkDevice:attachmentWasDisconnectedWithError:))

The method the framework calls when an error causes a VM’s network attachment to disconnect.


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