---
title: didEnterBackground
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/notificationcenter/messageidentifier/didenterbackground-1u5sm
---

# didEnterBackground

## Declaration

```swift
static var didEnterBackground: NotificationCenter.BaseMessageIdentifier<UIApplication.DidEnterBackgroundMessage> { get }
```

## See Also

### Identifying UIKit app life cycle messages

- [didFinishLaunching](foundation/notificationcenter/messageidentifier/didfinishlaunching.md)
- [didBecomeActive](foundation/notificationcenter/messageidentifier/didbecomeactive-2hcfs.md)
- [willEnterForeground](foundation/notificationcenter/messageidentifier/willenterforeground-95zi8.md)
- [willResignActive](foundation/notificationcenter/messageidentifier/willresignactive-4rf2p.md)
- [didReceiveMemoryWarning](foundation/notificationcenter/messageidentifier/didreceivememorywarning.md)
- [significantTimeChange](foundation/notificationcenter/messageidentifier/significanttimechange.md)
- [backgroundRefreshStatusDidChange](foundation/notificationcenter/messageidentifier/backgroundrefreshstatusdidchange.md)
- [userDidTakeScreenshot](foundation/notificationcenter/messageidentifier/userdidtakescreenshot.md)