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# NSTrackingSeparatorToolbarItem

A toolbar separator that aligns with the vertical split view in the same window.

```
class NSTrackingSeparatorToolbarItem
```

## Overview

Use a `NSTrackingSeparatorToolbarItem` to divide an [`NSToolbar`](/documentation/AppKit/NSToolbar) into sections that visually align with the views on either side of the divider of the [`splitView`](/documentation/AppKit/NSTrackingSeparatorToolbarItem/splitView). This keeps [`NSToolbarItem`](/documentation/AppKit/NSToolbarItem)s above the content that’s the [`target`](/documentation/AppKit/NSToolbarItem/target) for the item’s [`target`](/documentation/AppKit/NSToolbarItem/target).

The `splitView` must be in the same window as the toolbar containing this item before showing the toolbar.

## Topics

### Creating a tracking separator

[`init(identifier:splitView:dividerIndex:)`](/documentation/AppKit/NSTrackingSeparatorToolbarItem/init(identifier:splitView:dividerIndex:))

Creates a new tracking separator toolbar item and configures it to align with the divider of the split view.

### configuring a tracking separator

[`dividerIndex`](/documentation/AppKit/NSTrackingSeparatorToolbarItem/dividerIndex)

The index of the split view divider to align with the tracking separator.

[`splitView`](/documentation/AppKit/NSTrackingSeparatorToolbarItem/splitView)

The vertical split view to align with the toolbar separator.


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