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# PHChange

A description of a change that occurred in the photo library.

```
class PHChange
```

## Overview

Photos provides [`PHChange`](/documentation/Photos/PHChange) objects to notify your app of changes to the assets and collections managed by the Photos app. To receive change information, adopt the [`PHPhotoLibraryChangeObserver`](/documentation/Photos/PHPhotoLibraryChangeObserver) protocol and register your observer with the shared [`PHPhotoLibrary`](/documentation/Photos/PHPhotoLibrary) object.

After Photos provides a change object, you use its methods to get a change details object. Call the [`changeDetailsForObject:`](/documentation/Photos/PHChange/changeDetailsForObject:) or [`changeDetails(for:)`](/documentation/Photos/PHChange/changeDetails(for:)-33a6n) method, passing an asset or collection object you’ve previously fetched or a fetch result containing several such objects. The resulting [`PHObjectChangeDetails`](/documentation/Photos/PHObjectChangeDetails) or [`PHFetchResultChangeDetails`](/documentation/Photos/PHFetchResultChangeDetails) object describes any changes that have happened to the object or fetch result since you last fetched it.

## Topics

### Getting Change Details

[`changeDetails(for:)`](/documentation/Photos/PHChange/changeDetails(for:)-33a6n)

[`changeDetails(for:)`](/documentation/Photos/PHChange/changeDetails(for:)-536rd)

Returns detailed change information for the specified asset or collection.

[`changeDetails(for:)`](/documentation/Photos/PHChange/changeDetails(for:)-2fne7)

Returns detailed change information for a fetch result.

[`changeDetailsForObject:`](/documentation/Photos/PHChange/changeDetailsForObject:)

Returns detailed change information for the specified asset or collection.

[`changeDetailsForFetchResult:`](/documentation/Photos/PHChange/changeDetailsForFetchResult:)

Returns detailed change information for a fetch result.


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