---
title: "applicationWillResignActive(_:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nsapplicationdelegate/applicationwillresignactive(_:)"
---

# applicationWillResignActive(_:)

Tells the delegate that the app is about to become inactive and will lose focus.

## Declaration

```swift
@MainActor optional func applicationWillResignActive(_ notification: Notification)
```

## Parameters

- `notification`: A notification named doc://com.apple.appkit/documentation/AppKit/NSApplication/willResignActiveNotification. Calling the doc://com.apple.documentation/documentation/Foundation/NSNotification/object method of this notification returns the NSApplication object itself.

## See Also

### Managing Active Status

- [applicationWillBecomeActive(_:)](appkit/nsapplicationdelegate/applicationwillbecomeactive(_:).md)
- [applicationDidBecomeActive(_:)](appkit/nsapplicationdelegate/applicationdidbecomeactive(_:).md)
- [applicationDidResignActive(_:)](appkit/nsapplicationdelegate/applicationdidresignactive(_:).md)