---
title: AUViewController
framework: coreaudiokit
role: symbol
role_heading: Class
path: coreaudiokit/auviewcontroller
---

# AUViewController

The base class to extend when creating a custom user interface for an audio unit.

## Declaration

```swift
class AUViewController
```

## Overview

Overview This class doesn’t add any new methods or properties to its superclass, but it does conform to the NSExtensionRequestHandling protocol. A host app can access the view controller by calling the requestViewController(completionHandler:) method on the corresponding AUAudioUnit object. Subclassing Notes If an audio unit provides a custom view controller, the UI Audio Unit extension must implement a subclass of AUViewController and implement the AUAudioUnitFactory protocol inside the subclass.

## Relationships

### Inherits From

- [NSViewController](appkit/nsviewcontroller.md)
- [UIViewController](uikit/uiviewcontroller.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSCoding](foundation/nscoding.md)
- [NSEditor](appkit/nseditor.md)
- [NSExtensionRequestHandling](foundation/nsextensionrequesthandling.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [NSSeguePerforming](appkit/nssegueperforming.md)
- [NSStandardKeyBindingResponding](appkit/nsstandardkeybindingresponding.md)
- [NSTouchBarProvider](appkit/nstouchbarprovider.md)
- [NSUserActivityRestoring](appkit/nsuseractivityrestoring.md)
- [NSUserInterfaceItemIdentification](appkit/nsuserinterfaceitemidentification.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)
- [UIActivityItemsConfigurationProviding](uikit/uiactivityitemsconfigurationproviding.md)
- [UIAppearanceContainer](uikit/uiappearancecontainer.md)
- [UIContentContainer](uikit/uicontentcontainer.md)
- [UIFocusEnvironment](uikit/uifocusenvironment.md)
- [UIPasteConfigurationSupporting](uikit/uipasteconfigurationsupporting.md)
- [UIResponderStandardEditActions](uikit/uiresponderstandardeditactions.md)
- [UIStateRestoring](uikit/uistaterestoring.md)
- [UITraitChangeObservable](uikit/uitraitchangeobservable-67e94.md)
- [UITraitEnvironment](uikit/uitraitenvironment.md)
- [UIUserActivityRestoring](uikit/uiuseractivityrestoring.md)

## See Also

### Audio Units

- [AUAudioUnitViewConfiguration](coreaudiokit/auaudiounitviewconfiguration.md)
- [AUGenericView](coreaudiokit/augenericview.md)
- [AUPannerView](coreaudiokit/aupannerview.md)
- [AUCustomViewPersistentData](coreaudiokit/aucustomviewpersistentdata.md)