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

# applicationWillBecomeActive(_:)

Tells the delegate that the app is about to become active.

## Declaration

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

## Parameters

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

## See Also

### Related Documentation

- [applicationWillFinishLaunching(_:)](appkit/nsapplicationdelegate/applicationwillfinishlaunching(_:).md)

### Managing Active Status

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