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# backgroundEffect

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

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

## 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`](/documentation/UIKit/UIBarAppearance/backgroundColor) and [`backgroundImage`](/documentation/UIKit/UIBarAppearance/backgroundImage) on top of this effect.

---

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