# Document A document that supports both reading and writing. ``` protocol Document : ReadableDocument, WritableDocument ``` ## Overview `Document` is a convenience protocol that combines [`ReadableDocument`](/documentation/SwiftUI/ReadableDocument) and [`WritableDocument`](/documentation/SwiftUI/WritableDocument). Conform to it when your document can both open and save files: ``` @Observable final class TextDocument: Document { static let readableContentTypes = [UTType.plainText] var text: String = "" func reader(configuration: sending ReadConfiguration) -> sending FileWrapperDocumentReader { FileWrapperDocumentReader(configuration) { fileWrapper in guard let data = fileWrapper.regularFileContents else { throw CocoaError(.fileReadCorruptFile) } return String(decoding: data, as: UTF8.self) } } func writer(configuration: sending WriteConfiguration) -> sending FileWrapperDocumentWriter { FileWrapperDocumentWriter(configuration) { snapshot, _ in FileWrapper( regularFileWithContents: Data(snapshot.utf8) ) } } @MainActor func snapshot(contentType: UTType) async throws -> sending String { text } @MainActor func apply(snapshot: sending String, previous: sending String?) async throws { text = snapshot } } ``` Use [`DocumentGroup`](/documentation/SwiftUI/DocumentGroup) as your app’s first scene to opt into the document infrastructure (autosaving, file coordination, undo management, conflict resolution): ``` @main struct MyApp: App { var body: some Scene { DocumentGroup { document in TextEditorView(document: document) } makeDocument: { configuration, context in TextDocument() } } } ``` For a read-only document, conform only to [`ReadableDocument`](/documentation/SwiftUI/ReadableDocument). The document can be `@MainActor` or nonisolated, `Sendable` or not — use whichever works best for the app. ## Relationships ### Inherits From [`ReadableDocument`](/documentation/SwiftUI/ReadableDocument) [`WritableDocument`](/documentation/SwiftUI/WritableDocument) --- 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)