# optionalGroupWithCustomizationIdentifier:inDefaultCustomization:representativeItem:items: Creates an optional group that a person can move, add to, or remove from the navigation bar during layout customization. ``` + (UIBarButtonItemGroup *) optionalGroupWithCustomizationIdentifier:(NSString *) customizationIdentifier inDefaultCustomization:(BOOL) inDefaultCustomization representativeItem:(UIBarButtonItem *) representativeItem items:(NSArray *) items; ``` ## Parameters `customizationIdentifier` A unique string to identify the group for navigation bar layout customization. `inDefaultCustomization` A Boolean that determines whether to place the group in the navigation bar by default. Specify if you want the group to appear in the navigation bar customization popover by default. `representativeItem` The item to display for the group when space is constrained. `items` The items to include in the group. --- Copyright © 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)