OutlineGroup

struct · iOS 14.0+ · SDK 27.1

struct OutlineGroup<Data, ID, Parent, Leaf, Subgroup> where Data : RandomAccessCollection, ID : Hashable

A structure that computes views and disclosure groups on demand from an underlying collection of tree-structured, identified data. Use an outline group when you need a view that can represent a hierarchy of data by using disclosure views. This allows the user to navigate the tree structure by using the disclosure views to expand and collapse branches. In the following example, a tree structure of `FileItem` data offers a simplified view of a file system. Passing the root of this tree and the key path of its children allows you to quickly create a visual representation of the file system. struct FileItem: Hashable, Identifiable, CustomStringConvertible { var id: Self { self } var name: String var children: [FileItem]? = nil var description: String { switch children { case nil: return "📄 \(name)" case .some(let children): return children.isEmpty ? "📂 \(name)" : "📁 \(name)" } } } let data = FileItem(name: "users", children: [FileItem(name: "user1234", children: [FileItem(name: "Photos", children: [FileItem(name: "photo001.jpg"), FileItem(name: "photo002.jpg")]), FileItem(name: "Movies", children: [FileItem(name: "movie001.mp4")]), FileItem(name: "Documents", children: []) ]), FileItem(name: "newuser", children: [FileItem(name: "Documents", children: []) ]) ]) OutlineGroup(data, children: \.children) { item in Text("\(item.description)") } ### Type parameters Five generic type constraints define a specific `OutlineGroup` instance: - `Data`: The type of a collection containing the children of an element in the tree-shaped data. - `ID`: The type of the identifier for an element. - `Parent`: The type of the visual representation of an element whose children property is non-`nil` - `Leaf`: The type of the visual representation of an element whose children property is `nil`. - `Subgroup`: A type of a view that groups a parent view and a view representing its children, typically with some mechanism for showing and hiding the children

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