# init(viewing:viewer:) Creates a document group capable of viewing file documents. ``` nonisolated init(viewing documentType: Document.Type, @ContentBuilder viewer: @escaping (FileDocumentConfiguration) -> Content) ``` ## Parameters `documentType` The type of document your app can view. `viewer` The viewing UI for the provided document. ## Discussion Use this method to create a document group that can view files of a specific type. The example below creates a new document viewer for `MyImageFormatDocument` and displays them with `MyImageFormatViewer`: ``` @main struct MyApp: App { var body: some Scene { DocumentGroup(viewing: MyImageFormatDocument.self) { file in MyImageFormatViewer(image: file.document) } } } ``` With the `viewing:` initializer, SwiftUI considers your app as a viewer for given content types (readable content types declared on the document type). No File > New menu item is added on macOS, no New Document button appears in the iOS document browser, and the `FileDocumentConfiguration/isEditable` property is `false`, preventing accidental writes. Use the `DocumentGroup/init(newDocument:editor:)` initializer instead if your app needs to create or edit documents. You tell the system about the app’s role with respect to the document type by setting the `Info.plist` key with a value of `Viewer`. --- 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)