---
title: "beginSheet(content:completionHandler:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nswindow/beginsheet(content:completionhandler:)"
---

# beginSheet(content:completionHandler:)

Presents a SwiftUI view as a sheet on the receiving NSWindow.

## Declaration

```swift
@discardableResult @MainActor @preconcurrency func beginSheet<V>(@ContentBuilder content: () -> V, completionHandler: (() -> Void)? = nil) -> NSWindow.HostingSheetRepresentation<V> where V : View
```

## Parameters

- `content`: The SwiftUI view to present in a sheet.
- `completionHandler`: An optional completion handler that is called when the sheet is dismissed for any reason.

## Return Value

Return Value A discardable NSWindow.HostingSheetRepresentation instance.

## Discussion

Discussion The presented view supports the same features as when used in the sheet(isPresented:onDismiss:content:) or sheet(item:onDismiss:content:) view modifier, such as: Automatic dismissal with the Escape key and disabling interactive dismissal with interactiveDismissDisabled(_:) Use of dismiss to dismiss the sheet Sheet sizing using presentationSizing(_:) Standard sheet toolbars using toolbar(content:). parentWindow.beginSheet {     NameADogSheet(dog: observableDog) }

struct NameADogSheet: View {     var dog: Dog     @Environment(\.dismiss) private var dismiss     @State private var name: String = ""

var body: some View {         Form {             TextField("Who's a good dog?", text: $name)         }         .formStyle(.grouped)         .toolbar {             ToolbarItem(placement: .cancellationAction) {                 Button("Cancel") {                     dismiss()                 }             }             ToolbarItem(placement: .confirmationAction) {                 Button("Suggest Name") {                     dog.name = name                     dismiss()                 }                 .disabled(name.isEmpty)             }         }     } } The returned NSWindow.HostingSheetRepresentation can be ignored unless the sheet needs to be manipulated from an AppKit context, such as changing the root view or programmatically changing the sheet.