# callAsFunction(_:) Presents a new document window. ``` @MainActor @preconcurrency func callAsFunction(_ newDocument: @autoclosure @escaping @Sendable () -> D) where D : FileDocument ``` ## Parameters `newDocument` The new file document to present. ## Discussion Don’t call this method directly. SwiftUI calls it when you call the [`newDocument`](/documentation/SwiftUI/EnvironmentValues/newDocument) action: ``` newDocument(TextDocument(text: selectedText)) ``` For information about how Swift uses the `callAsFunction()` method to simplify call site syntax, see [Methods with Special Names](https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID622) in *The Swift Programming Language*. --- 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)