---
title: UICollectionViewFlowLayoutInvalidationContext
framework: uikit
role: symbol
role_heading: Class
path: uikit/uicollectionviewflowlayoutinvalidationcontext
---

# UICollectionViewFlowLayoutInvalidationContext

A set of properties for determining whether to recompute the size of items or their position in the layout.

## Declaration

```swift
@MainActor class UICollectionViewFlowLayoutInvalidationContext
```

## Overview

Overview The flow layout object creates instances of this class when it needs to invalidate its contents in response to changes. You can also create instances when invalidating the flow layout manually.

## Topics

### Specifying what to invalidate

- [invalidateFlowLayoutDelegateMetrics](uikit/uicollectionviewflowlayoutinvalidationcontext/invalidateflowlayoutdelegatemetrics.md)
- [invalidateFlowLayoutAttributes](uikit/uicollectionviewflowlayoutinvalidationcontext/invalidateflowlayoutattributes.md)

## Relationships

### Inherits From

- [UICollectionViewLayoutInvalidationContext](uikit/uicollectionviewlayoutinvalidationcontext.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Manual layouts

- [Customizing collection view layouts](uikit/customizing-collection-view-layouts.md)
- [UICollectionViewLayout](uikit/uicollectionviewlayout.md)
- [UICollectionViewFlowLayout](uikit/uicollectionviewflowlayout.md)
- [UICollectionViewTransitionLayout](uikit/uicollectionviewtransitionlayout.md)
- [UICollectionViewLayoutAttributes](uikit/uicollectionviewlayoutattributes.md)