---
title: invalidationHandler
framework: exposurenotification
role: symbol
role_heading: Instance Property
path: exposurenotification/enmanager/invalidationhandler
---

# invalidationHandler

The handler that the framework invokes when invalidation completes.

## Declaration

```swift
var invalidationHandler: (() -> Void)? { get set }
```

## Discussion

Discussion The framework invokes this handler only once, and clears the property before invoking it to break retain cycles.