---
title: didBecomeActiveNotification
framework: avfaudio
role: symbol
role_heading: Type Property
path: avfaudio/avaudiosession/didbecomeactivenotification
---

# didBecomeActiveNotification

Notification sent when the audio session becomes active.

## Declaration

```swift
class let didBecomeActiveNotification: NSNotification.Name
```

## Discussion

Discussion This notification has no userInfo payload.

## See Also

### Observing activation lifecycle

- [didBecomeInactiveNotification](avfaudio/avaudiosession/didbecomeinactivenotification.md)
- [resumptionRecommendationNotification](avfaudio/avaudiosession/resumptionrecommendationnotification.md)
- [deactivationContextKey](avfaudio/avaudiosession/deactivationcontextkey.md)
- [resumptionContextKey](avfaudio/avaudiosession/resumptioncontextkey.md)
- [AVAudioSession.DidBecomeActiveMessage](avfaudio/avaudiosession/didbecomeactivemessage.md)
- [AVAudioSession.DidBecomeInactiveMessage](avfaudio/avaudiosession/didbecomeinactivemessage.md)
- [AVAudioSession.ResumptionRecommendationMessage](avfaudio/avaudiosession/resumptionrecommendationmessage.md)
- [AVAudioSession.DeactivationResult](avfaudio/avaudiosession/deactivationresult.md)
- [AVAudioSession.DeactivationContext](avfaudio/avaudiosession/deactivationcontext.md)
- [AVAudioSession.DeactivationSource](avfaudio/avaudiosession/deactivationsource.md)
- [AVAudioSession.InterruptionContext](avfaudio/avaudiosession/interruptioncontext.md)
- [AVAudioSession.ResumptionContext](avfaudio/avaudiosession/resumptioncontext.md)
- [AVAudioSession.ResumptionRecommendation](avfaudio/avaudiosession/resumptionrecommendation.md)