---
title: backIndicatorTransitionMaskImage
framework: uikit
role: symbol
role_heading: Instance Property
path: uikit/uinavigationbar/backindicatortransitionmaskimage
---

# backIndicatorTransitionMaskImage

The image used as a mask for content during push and pop transitions.

## Declaration

```swift
var backIndicatorTransitionMaskImage: UIImage? { get set }
```

## Discussion

Discussion If you want to customize the back indicator image, you must also set backIndicatorImage.

## See Also

### Configuring the Back button

- [backIndicatorImage](uikit/uinavigationbar/backindicatorimage.md)