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

# windowWillStartLiveResize(_:)

Tells the delegate that the window is about to be live resized.

## Declaration

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

## Parameters

- `notification`: A notification named doc://com.apple.appkit/documentation/AppKit/NSWindow/willStartLiveResizeNotification.

## Discussion

Discussion You can retrieve the window object in question by sending object to notification.

## See Also

### Sizing Windows

- [windowWillResize(_:to:)](appkit/nswindowdelegate/windowwillresize(_:to:).md)
- [windowDidResize(_:)](appkit/nswindowdelegate/windowdidresize(_:).md)
- [windowDidEndLiveResize(_:)](appkit/nswindowdelegate/windowdidendliveresize(_:).md)