<!--
{
  "availability" : [
    "macOS: 10.10.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AppKit",
  "identifier" : "/documentation/AppKit/NSWindow/addTitlebarAccessoryViewController(_:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "AppKit"
    ],
    "preciseIdentifier" : "c:objc(cs)NSWindow(im)addTitlebarAccessoryViewController:"
  },
  "title" : "addTitlebarAccessoryViewController(_:)"
}
-->

# addTitlebarAccessoryViewController(_:)

Adds the specified title bar accessory view controller to the window.

```
func addTitlebarAccessoryViewController(_ childViewController: NSTitlebarAccessoryViewController)
```

## Parameters

`childViewController`

An instance of [`NSTitlebarAccessoryViewController`](/documentation/AppKit/NSTitlebarAccessoryViewController) containing the view to add, along with where to place it and how it should behave in full screen mode.

## Discussion

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)