---
title: "callAsFunction(_:)"
framework: swiftui
role: symbol
role_heading: Instance Method
path: "swiftui/newdocumentaction/callasfunction(_:)"
---

# callAsFunction(_:)

Presents a new document window.

## Declaration

```swift
@MainActor @preconcurrency func callAsFunction<D>(_ newDocument: @autoclosure @escaping @Sendable () -> D) where D : FileDocument
```

## Parameters

- `newDocument`: The new file document to present.

## Discussion

Discussion Don’t call this method directly. SwiftUI calls it when you call the 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 in The Swift Programming Language.

## See Also

### Calling the action

- [callAsFunction(contentType:)](swiftui/newdocumentaction/callasfunction(contenttype:).md)
- [callAsFunction(contentType:prepareDocument:)](swiftui/newdocumentaction/callasfunction(contenttype:preparedocument:).md)