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# UIBackgroundExtensionView

A view that extends content to fill its own bounds.

```
class UIBackgroundExtensionView
```

## Overview

A background extension view can be laid out to extend outside the safe area,
such as under a sidebar or an inspector. By default, the view lays out
its content to stay within the safe area, and uses modifications of the
content along the edges to fill the container view.

## Relationships

### Conforms To

[`CMBodyIdentifiable`](/documentation/CoreMotion/CMBodyIdentifiable)

[`UIAppearanceContainer`](/documentation/UIKit/UIAppearanceContainer)

[`UITraitChangeObservable-67e94`](/documentation/UIKit/UITraitChangeObservable-67e94)

[`CVarArg`](/documentation/Swift/CVarArg)

[`UIResponderStandardEditActions`](/documentation/UIKit/UIResponderStandardEditActions)

[`CLBodyIdentifiable`](/documentation/CoreLocation/CLBodyIdentifiable)

[`UIUserActivityRestoring`](/documentation/UIKit/UIUserActivityRestoring)

[`Sendable`](/documentation/Swift/Sendable)

[`UICoordinateSpace`](/documentation/UIKit/UICoordinateSpace)

[`UIActivityItemsConfigurationProviding`](/documentation/UIKit/UIActivityItemsConfigurationProviding)

[`UIPasteConfigurationSupporting`](/documentation/UIKit/UIPasteConfigurationSupporting)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`CALayerDelegate`](/documentation/QuartzCore/CALayerDelegate)

[`UIFocusItemContainer`](/documentation/UIKit/UIFocusItemContainer)

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`UIFocusEnvironment`](/documentation/UIKit/UIFocusEnvironment)

[`NSCoding`](/documentation/Foundation/NSCoding)

[`UIAppearance`](/documentation/UIKit/UIAppearance)

[`UIDynamicItem`](/documentation/UIKit/UIDynamicItem)

[`Equatable`](/documentation/Swift/Equatable)

[`UIFocusItem`](/documentation/UIKit/UIFocusItem)

[`UIAccessibilityIdentification`](/documentation/UIKit/UIAccessibilityIdentification)

[`UIPopoverPresentationControllerSourceItem`](/documentation/UIKit/UIPopoverPresentationControllerSourceItem)

[`UITraitEnvironment`](/documentation/UIKit/UITraitEnvironment)

[`UILargeContentViewerItem`](/documentation/UIKit/UILargeContentViewerItem)

[`Hashable`](/documentation/Swift/Hashable)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`NSTouchBarProvider`](/documentation/AppKit/NSTouchBarProvider)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

### Inherits From

[`UIView`](/documentation/UIKit/UIView)

---

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