---
title: "setBackIndicatorImage(_:transitionMaskImage:)"
framework: uikit
role: symbol
role_heading: Instance Method
path: "uikit/uinavigationbarappearance/setbackindicatorimage(_:transitionmaskimage:)"
---

# setBackIndicatorImage(_:transitionMaskImage:)

Sets the back button indicator image and its transition mask.

## Declaration

```swift
func setBackIndicatorImage(_ backIndicatorImage: UIImage?, transitionMaskImage backIndicatorTransitionMaskImage: UIImage?)
```

## Parameters

- `backIndicatorImage`: The image to display on the leading edge of the back button.
- `backIndicatorTransitionMaskImage`: The image for masking content flowing under the back indicator image during push and pop transitions.

## Discussion

Discussion If you specify nil for either backIndicatorImage or backIndicatorTransitionMaskImage, this method resets both images to their default values.

## See Also

### Configuring the Back button

- [backButtonAppearance](uikit/uinavigationbarappearance/backbuttonappearance.md)
- [backIndicatorImage](uikit/uinavigationbarappearance/backindicatorimage.md)
- [backIndicatorTransitionMaskImage](uikit/uinavigationbarappearance/backindicatortransitionmaskimage.md)