# beginSheet(content:completionHandler:) Presents a SwiftUI view as a sheet on the receiving NSWindow. ``` @discardableResult @MainActor @preconcurrency func beginSheet(@ContentBuilder content: () -> V, completionHandler: (() -> Void)? = nil) -> NSWindow.HostingSheetRepresentation 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 A discardable [`NSWindow.HostingSheetRepresentation`](/documentation/AppKit/NSWindow/HostingSheetRepresentation) instance. ## Discussion The presented view supports the same features as when used in the or view modifier, such as: - Automatic dismissal with the Escape key and disabling interactive dismissal with - Use of [`@Environment(\.dismiss)`](doc://com.apple.documentation/documentation/SwiftUI/EnvironmentValues/dismiss) to dismiss the sheet - Sheet sizing using - Standard sheet toolbars using . ``` 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`](/documentation/AppKit/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. --- 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)