---
title: "splitView(_:shouldCollapseSubview:forDoubleClickOnDividerAt:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nssplitviewcontroller/splitview(_:shouldcollapsesubview:fordoubleclickondividerat:)"
---

# splitView(_:shouldCollapseSubview:forDoubleClickOnDividerAt:)

Allows the split view controller to determine if a subview collapses in response to a double click.

## Declaration

```swift
func splitView(_ splitView: NSSplitView, shouldCollapseSubview subview: NSView, forDoubleClickOnDividerAt dividerIndex: Int) -> Bool
```

## See Also

### Managing Subviews

- [splitView(_:canCollapseSubview:)](appkit/nssplitviewcontroller/splitview(_:cancollapsesubview:).md)