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# addSplitViewItem(_:)

Adds a split view item to the end of the array of split view items.

```
func addSplitViewItem(_ splitViewItem: NSSplitViewItem)
```

## Parameters

`splitViewItem`

The split view item to add.
  
  > Important:
  > Before you add a split view item, it must be non-`nil` and it must have an associated view controller, or the system throws an exception.

## Discussion

This is a convenience method you can use in place of the [`insertSplitViewItem(_:at:)`](/documentation/AppKit/NSSplitViewController/insertSplitViewItem(_:at:)) method when you want to add a split view item to the end of the [`splitViewItems`](/documentation/AppKit/NSSplitViewController/splitViewItems) array. Calling this method implicitly calls the [`insertSplitViewItem(_:at:)`](/documentation/AppKit/NSSplitViewController/insertSplitViewItem(_:at:)) method.

If you subclass the [`NSSplitViewController`](/documentation/AppKit/NSSplitViewController) class, don’t call this method in your custom object to add a split view item. Instead, call the [`insertSplitViewItem(_:at:)`](/documentation/AppKit/NSSplitViewController/insertSplitViewItem(_:at:)) method directly.

---

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