---
title: NSPageController.TransitionStyle.stackBook
framework: appkit
role: symbol
role_heading: Case
path: appkit/nspagecontroller/transitionstyle-swift.enum/stackbook
---

# NSPageController.TransitionStyle.stackBook

Pages are stacked on top of each other. Pages animate out to the left to reveal the next page. Previous pages animate in from the left.

## Declaration

```swift
case stackBook
```

## See Also

### Constants

- [NSPageController.TransitionStyle.stackHistory](appkit/nspagecontroller/transitionstyle-swift.enum/stackhistory.md)
- [NSPageController.TransitionStyle.horizontalStrip](appkit/nspagecontroller/transitionstyle-swift.enum/horizontalstrip.md)