# toolbar(_:itemIdentifier:canBeInsertedAt:) Asks the delegate for a Boolean value that indicates whether the toolbar can place the item at the specified position. ``` @MainActor optional func toolbar(_ toolbar: NSToolbar, itemIdentifier: NSToolbarItem.Identifier, canBeInsertedAt index: Int) -> Bool ``` ## Parameters `toolbar` The toolbar that contains the items. `itemIdentifier` The identifier of the toolbar item to insert at the specified index. `index` The proposed index at which to place the item. If the toolbar is removing the item, this value is . ## Return Value to allow the toolbar to place the item at the specified location, or to prevent the toolbar from placing the item in that location. ## Discussion Implement this method to control the placement of items in the toolbar. During a drag operation, the toolbar calls this method to determine if the specified index is an acceptable location for the item. Return a Boolean value that indicates whether the new posiition is acceptable. Don’t use the `index` parameter to determine the final location of the toolbar item. During a drag operation, the toolbar can call this method multiple times, so the index value can change later. --- 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)