A description of a change that occurred in the Photos library.
- iOS 8.0+
- macOS 10.13+
- tvOS 10.0+
PHChange objects to notify your app of changes to the assets and collections managed by the Photos app. To receive change information, adopt the
PHPhoto protocol and register your observer with the shared
After Photos provides you with a change object, you use its methods to get a change details object. Call the
change method, passing an asset or collection object you’ve previously fetched or a fetch result containing several such objects. The resulting
PHFetch object describes any changes that have happened to the object or fetch result since you last fetched it.