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

# splitView(_:additionalEffectiveRectOfDividerAt:)

Allows the split view controller to return an additional rectangle where mouse clicks can initiate divider dragging.

## Declaration

```swift
@MainActor func splitView(_ splitView: NSSplitView, additionalEffectiveRectOfDividerAt dividerIndex: Int) -> NSRect
```

## See Also

### Configuring and Drawing View Dividers

- [splitView(_:effectiveRect:forDrawnRect:ofDividerAt:)](appkit/nssplitviewcontroller/splitview(_:effectiverect:fordrawnrect:ofdividerat:).md)
- [splitView(_:shouldHideDividerAt:)](appkit/nssplitviewcontroller/splitview(_:shouldhidedividerat:).md)