Description I would like to request native reordering support for SwiftUI hierarchical views, especially OutlineGroup and List(_:children:). In iOS 27, SwiftUI introduces the new reordering APIs: .reorderable() .reorderable(collectionID:) .reorderContainer(for:move:) .reorderContainer(for:in:move:) These APIs work well for flat collections and explicit sectioned collections, but they do not appear to integrate with OutlineGroup, even though OutlineGroup is the natural SwiftUI API for tree-structured data. Currently, OutlineGroup hides the internal recursive ForEach / DisclosureGroup structure, so there is no obvious place to apply reorderable(collectionID:) at each hierarchy level. Current Working Pattern for Sections This works when each parent is represented manually as a section: struct SectionModel: Identifiable { let id: UUID var title: String var items: [Item] } struct Item: Identifiable { let id: UUID var title: String } struct ContentView: View { @State private var sections: [SectionModel] = sampleSections var body: some View { List { ForEach(sections) { section in Section(section.title) { ForEach(section.items) { item in Text(item.title) } .reorderable(collectionID: section.id) } } } .reorderContainer(for: Item.self, in: SectionModel.ID.self) { difference in apply(difference) } } private func apply(_ difference: ReorderDifference<Item.ID, SectionModel.ID>) { // Move item between explicit sections. } } But this does not scale naturally to arbitrary tree data. Desired API Ideally, this should work with OutlineGroup: struct Node: Identifiable { let id: UUID var title: String var children: [Node]? } struct ContentView: View { @State private var nodes: [Node] = sampleTree var body: some View { List { OutlineGroup(nodes, children: \.children) { node in Text(node.title) } .reorderable() } .reorderContainer(for: Node.self) { difference in apply(difference) } } private func apply(_ difference: ReorderDifference<Node.ID, ???>) { // Move node within the tree. } } For hierarchical data, SwiftUI would need to expose the parent or collection identity of the source and destination. For example, something like: .reorderableTree( children: \.children, allowsMoveIntoChildren: true ) Or an overload such as: OutlineGroup(nodes, children: \.children) { node in Text(node.title) } .reorderable(collectionID: \.parentID) With a ReorderDifference that includes: sourceParentID destinationParentID destinationPosition movedItemIDs Why This Matters Many apps represent user-created hierarchical data: folders bookmark collections nested lists project outlines document trees sidebar hierarchies OutlineGroup is the natural SwiftUI abstraction for displaying this data, but reordering currently requires either: 1abandoning OutlineGroup and rebuilding a recursive outline manually; 2flattening the hierarchy into sections, losing the real outline interaction; 3using older manual drag/drop APIs; 4falling back to UIKit/AppKit. None of these approaches feels aligned with SwiftUI's declarative model. Specific Request Please consider adding native reorder support to OutlineGroup and List(_:children:), including support for: moving items within the same parent; moving items between parents; optionally moving an item into another item as a child; preventing invalid moves, such as moving a parent into one of its descendants; exposing source and destination parent identifiers in the move callback; preserving SwiftUI's built-in disclosure UI. Minimal Example of the Current Limitation This is the kind of code I would expect to be possible: List { OutlineGroup(nodes, children: \.children) { node in Text(node.title) } .reorderable() } .reorderContainer(for: Node.self, in: Node.ID.self) { difference in moveNode(using: difference) } But because OutlineGroup creates its recursive rows internally, there is no clear way to attach reorderable(collectionID:) to each parent's child collection. Expected Outcome SwiftUI should provide a first-class way to reorder hierarchical data displayed with OutlineGroup, similar to how flat and sectioned collections can now use reorderable and reorderContainer.