---
title: collapseBehavior
framework: appkit
role: symbol
role_heading: Instance Property
path: appkit/nssplitviewitem/collapsebehavior-swift.property
---

# collapseBehavior

The resizing behavior when the split view item toggles its collapsed state.

## Declaration

```swift
var collapseBehavior: NSSplitViewItem.CollapseBehavior { get set }
```

## Discussion

Discussion The default value of this property is NSSplitViewItem.CollapseBehavior.default.

## See Also

### Collapsing and expanding the item

- [isCollapsed](appkit/nssplitviewitem/iscollapsed.md)
- [canCollapse](appkit/nssplitviewitem/cancollapse.md)
- [NSSplitViewItem.CollapseBehavior](appkit/nssplitviewitem/collapsebehavior-swift.enum.md)
- [isSpringLoaded](appkit/nssplitviewitem/isspringloaded.md)
- [canCollapseFromWindowResize](appkit/nssplitviewitem/cancollapsefromwindowresize.md)