---
title: "splitView(_:canCollapseSubview:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nssplitviewcontroller/splitview(_:cancollapsesubview:)"
---

# splitView(_:canCollapseSubview:)

Allows the split view controller to determine whether the user can collapse and expand the specified subview.

## Declaration

```swift
@MainActor func splitView(_ splitView: NSSplitView, canCollapseSubview subview: NSView) -> Bool
```

## See Also

### Managing Subviews

- [splitView(_:shouldCollapseSubview:forDoubleClickOnDividerAt:)](appkit/nssplitviewcontroller/splitview(_:shouldcollapsesubview:fordoubleclickondividerat:).md)