---
title: closeReasonUserInfoKey
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nspopover/closereasonuserinfokey
---

# closeReasonUserInfoKey

The userInfo key containing the reason for the willCloseNotification.

## Declaration

```swift
class let closeReasonUserInfoKey: String
```

## See Also

### Constants

- [NSPopover.Behavior](appkit/nspopover/behavior-swift.enum.md)
- [NSPopover.CloseReason](appkit/nspopover/closereason.md)
- [NSPopover.Appearance](appkit/nspopover/appearance-swift.enum.md)