---
title: didChangeOcclusionState
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/notificationcenter/messageidentifier/didchangeocclusionstate-5853a
---

# didChangeOcclusionState

## Declaration

```swift
static var didChangeOcclusionState: NotificationCenter.BaseMessageIdentifier<NSWindow.DidChangeOcclusionStateMessage> { get }
```