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# customizationRequiredItemIdentifiers

An optional list of identifiers for items you want to always appear in the Touch Bar and which the user can’t remove during customization.

```
var customizationRequiredItemIdentifiers: [NSTouchBarItem.Identifier] { get set }
```

## Discussion

Configure this property at your discretion, depending on the design of your app.

The system archives this property.

## See Also

[`defaultItemIdentifiers`](/documentation/AppKit/NSTouchBar/defaultItemIdentifiers)

A required list of identifiers for items that you want to appear in the Touch Bar after instantiating it.

[`itemIdentifiers`](/documentation/AppKit/NSTouchBar/itemIdentifiers)

The list of identifiers for the current items in the Touch Bar.


---

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