---
title: "viewWillMove(toWindow:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nsvisualeffectview/viewwillmove(towindow:)"
---

# viewWillMove(toWindow:)

Notifies the view immediately before it moves to a new window (which may be nil).

## Declaration

```swift
func viewWillMove(toWindow newWindow: NSWindow?)
```

## Parameters

- `newWindow`: The window object that will be at the root of the view’s new view hierarchy. If the view is being removed from a window and there isn’t a new window, this parameter is nil.

## Discussion

Discussion When subclassing, you can override this method and use it to perform any tasks associated with the change. You must call super at some point during your implementation.

## See Also

### Handling Moves to a Different Window

- [viewDidMoveToWindow()](appkit/nsvisualeffectview/viewdidmovetowindow().md)