---
title: backgroundEffect
framework: uikit
role: symbol
role_heading: Instance Property
path: uikit/uibarappearance/backgroundeffect
---

# backgroundEffect

The blur effect to apply to the bar’s background.

## Declaration

```swift
@NSCopying var backgroundEffect: UIBlurEffect? { get set }
```

## Discussion

Discussion The blur effect provides the base layer for the bar’s appearance, and it determines how much of the underlying content is visible. UIKit applies the backgroundColor and backgroundImage on top of this effect.

## See Also

### Configuring the background appearance

- [backgroundColor](uikit/uibarappearance/backgroundcolor.md)
- [backgroundImage](uikit/uibarappearance/backgroundimage.md)
- [backgroundImageContentMode](uikit/uibarappearance/backgroundimagecontentmode.md)