---
title: "menuWillOpen(_:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nsmenudelegate/menuwillopen(_:)"
---

# menuWillOpen(_:)

Invoked when a menu is about to open.

## Declaration

```swift
@MainActor optional func menuWillOpen(_ menu: NSMenu)
```

## Parameters

- `menu`: The menu that is about to open.

## Discussion

Discussion Don’t modify the structure of the menu or the menu items during this method.

## See Also

### Handling Open and Close Events

- [menuDidClose(_:)](appkit/nsmenudelegate/menudidclose(_:).md)