---
title: "windowWillEnterVersionBrowser(_:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nswindowdelegate/windowwillenterversionbrowser(_:)"
---

# windowWillEnterVersionBrowser(_:)

Tells the delegate the window is about to enter version browsing.

## Declaration

```swift
@MainActor optional func windowWillEnterVersionBrowser(_ notification: Notification)
```

## Parameters

- `notification`: An doc://com.apple.appkit/documentation/AppKit/NSWindow/willEnterVersionBrowserNotification notification.

## See Also

### Managing Presentation in Version Browsers

- [window(_:willResizeForVersionBrowserWithMaxPreferredSize:maxAllowedSize:)](appkit/nswindowdelegate/window(_:willresizeforversionbrowserwithmaxpreferredsize:maxallowedsize:).md)
- [windowDidEnterVersionBrowser(_:)](appkit/nswindowdelegate/windowdidenterversionbrowser(_:).md)
- [windowWillExitVersionBrowser(_:)](appkit/nswindowdelegate/windowwillexitversionbrowser(_:).md)
- [windowDidExitVersionBrowser(_:)](appkit/nswindowdelegate/windowdidexitversionbrowser(_:).md)