# init(_:children:rowContent:) Creates a hierarchical list that computes its rows on demand from a binding to an underlying collection of identifiable data. ``` nonisolated init(_ data: Binding, children: WritableKeyPath, @ContentBuilder rowContent: @escaping (Binding) -> RowContent) where Content == OutlineGroup, Data.Element.ID, RowContent, RowContent, DisclosureGroup>, Data : MutableCollection, Data : RandomAccessCollection, RowContent : View, Data.Element : Identifiable ``` ## Parameters `data` A collection of identifiable data for computing the list. `children` A key path to a property whose non-`nil` value gives the children of `data`. A non-`nil` but empty value denotes a node capable of having children that is currently childless, such as an empty directory in a file system. On the other hand, if the property at the key path is `nil`, then `data` is treated as a leaf node in the tree, like a regular file in a file system. `rowContent` A content builder that creates the view for a single row of the list. --- 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)