---
title: NSAlert.Style.critical
framework: appkit
role: symbol
role_heading: Case
path: appkit/nsalert/style/critical
---

# NSAlert.Style.critical

An alert style to inform someone about a critical event.

## Declaration

```swift
case critical
```

## Discussion

Discussion Use this alert style sparingly and only when extra attention is really needed (for example when confirming an action that may result in the unexpected loss of data).

## See Also

### Enumeration Cases

- [NSAlert.Style.warning](appkit/nsalert/style/warning.md)
- [NSAlert.Style.informational](appkit/nsalert/style/informational.md)