struct · iOS 26.0+ · SDK 27.1
@MainActor struct BackForwardListAn observable representation of a webpage's previously loaded resources. This type can be used to facilitate navigating to prior or subsequent loaded resources and for observing when new entries get added or removed. In this example, the back-forward list is used to create a SwiftUI View to facilitate navigating to previous or next items: ```swift private struct BackForwardMenuView: View { struct LabelConfiguration { let text: String let systemImage: String } let list: [WebPage.BackForwardList.Item] let label: LabelConfiguration let navigateToItem: (WebPage.BackForwardList.Item) -> Void var body: some View { Menu { ForEach(list) { item in Button(item.title ?? item.url.absoluteString) { navigateToItem(item) } } } label: { Label(label.text, systemImage: label.systemImage) .labelStyle(.iconOnly) } primaryAction: { navigateToItem(list.first!) } .disabled(list.isEmpty) } } ``` The view can then be used for both the back and forward list using a specific ``WebPage``: ```swift struct ContentView: some View { @State private var page = WebPage() var body: some View { WebView(page) .toolbar { ToolbarItemGroup { ToolbarBackForwardMenuView( list: page.backForwardList.backList.reversed(), label: .init(text: "Backward", systemImage: "chevron.backward") ) { viewModel.page.load($0) } ToolbarBackForwardMenuView( list: page.backForwardList.forwardList, label: .init(text: "Forward", systemImage: "chevron.forward") ) { viewModel.page.load($0) } } } } } ``` Because ``WebPage/backForwardList`` is an observable property, the states of these buttons are automatically updated.
get backList(): Promise<Array<WebPage_BackForwardList_Item>>@MainActor var backList: [WebPage.BackForwardList.Item] { get }The array of items that precede the current item. The items are in the order in which the page originally visited them.
get forwardList(): Promise<Array<WebPage_BackForwardList_Item>>@MainActor var forwardList: [WebPage.BackForwardList.Item] { get }The array of items that follow the current item. The items are in the order in which they were originally visited.
get currentItem(): Promise<(WebPage_BackForwardList_Item) | null>@MainActor var currentItem: WebPage.BackForwardList.Item? { get }The current item. When the webpage has not loaded any resources, this value will be `nil`.
subscript(index: number): Promise<(WebPage_BackForwardList_Item) | null>@MainActor subscript(index: Int) -> WebPage.BackForwardList.Item? { get }Accesses the item at the relative offset from the current item. - Parameter index: The offset of the desired item from the current item. Specify `0` for the current item, `-1` for the immediately preceding item, `1` for the immediately following item, and so on. - Returns: The item at the specified offset from the current item, or `nil` if the index exceeds the limits of the list.
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