---
title: wantsIncrementalChangeDetails
framework: photos
role: symbol
role_heading: Instance Property
path: photos/phfetchoptions/wantsincrementalchangedetails
---

# wantsIncrementalChangeDetails

A Boolean value that determines whether your app receives detailed change information for the objects in the fetch result.

## Declaration

```swift
var wantsIncrementalChangeDetails: Bool { get set }
```

## Discussion

Discussion If you have registered a change observer with the shared PHPhotoLibrary object, fetching assets or collections automatically registers your observer to receive information about later changes to the fetch result and about the objects it contains. For a fetch result, change information (a PHFetchResultChangeDetails object) can include a detailed list of incremental differences from the previous state of the fetch result, such as new photos captured since the original fetch. If true (the default), Photos sends detailed incremental changes when such information is available. If false, Photos tells your app only when the fetch result has changed (in which case you can perform the fetch again to receive updated results).