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# tabViewDidChangeNumberOfTabViewItems(_:)

Informs the delegate that the number of tab view items in `tabView` has changed.

```
@MainActor optional func tabViewDidChangeNumberOfTabViewItems(_ tabView: NSTabView)
```

## Parameters

`tabView`

The tab view that added or removed tabview items.

## See Also

  [Tab View Programming Topics](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/TabView/TabView.html#//apple_ref/doc/uid/10000074i)

[`numberOfTabViewItems`](/documentation/AppKit/NSTabView/numberOfTabViewItems)

The number of items in the tab view’s array of tab view items.


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