---
title: NSWindow.WillBeginSheetMessage
framework: appkit
role: symbol
role_heading: Structure
path: appkit/nswindow/willbeginsheetmessage
---

# NSWindow.WillBeginSheetMessage

## Declaration

```swift
struct WillBeginSheetMessage
```

## Topics

### Initializers

- [init(window:)](appkit/nswindow/willbeginsheetmessage/init(window:).md)

### Instance Properties

- [window](appkit/nswindow/willbeginsheetmessage/window.md)

## Relationships

### Conforms To

- [Copyable](swift/copyable.md)
- [Escapable](swift/escapable.md)
- [NotificationCenter.MainActorMessage](foundation/notificationcenter/mainactormessage.md)
- [SendableMetatype](swift/sendablemetatype.md)