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# navigationItemDidUpdate()

Provides an opportunity to customize the navigation items after the navigation bar updates.

```
func navigationItemDidUpdate()
```

## Discussion

The system calls `navigationItemDidUpdate()` every time `UIDocumentViewController` makes changes to the navigation item. Customize the navigation items in this method.

This example adds buttons to the navigation bar and customizes the toolbar:

```swift
class EditorViewController:
        UIDocumentViewController,
        UINavigationItemRenameDelegate {

    override func navigationItemDidUpdate() {
        navigationItem.customizationIdentifier = "editorViewCustomization"
        configureCenterItemGroups()
        navigationItem.rightBarButtonItem = splitView.previewVisibilityBarButton
    }

}
```

---

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