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# applicationWillTerminate(_:)

Tells the delegate that the app is about to terminate.

```
@MainActor optional func applicationWillTerminate(_ notification: Notification)
```

## Parameters

`notification`

A notification named [`willTerminateNotification`](/documentation/AppKit/NSApplication/willTerminateNotification). Calling the <doc://com.apple.documentation/documentation/Foundation/NSNotification/object> method of this notification returns the `NSApplication` object itself.

## Discussion

Your delegate can use this method to perform any final cleanup before the app terminates.  The app will terminate after this method returns.

> Note: This method isn’t called during sudden termination of an app. For more information about sudden termination, see the section  <doc://com.apple.documentation/documentation/Foundation/ProcessInfo> of <doc://com.apple.documentation/documentation/Foundation/ProcessInfo>.

## See Also

[`terminate(_:)`](/documentation/AppKit/NSApplication/terminate(_:))

Terminates the receiver.


---

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