Returns detailed change information for the specified asset or collection.
- iOS 8.0+
- macOS 10.11+
- Mac Catalyst 13.0+
- tvOS 10.0+
- Xcode 8.0+
A change details object, or
nil if there have been no changes to the specified asset or collection.
When Photos calls your change observer’s
photo method, call this
change method to get detailed change information about an asset or collection you’ve previously fetched. If the asset or collection has changed since you last fetched it, the resulting
PHObject object describes the changes. If there are no changes between the fetched object and the current state of the asset or collection it represents in the Photos library, this method returns
For an asset collection or collection list, this method and the
PHObject object it returns describe only changes to the collection’s properties. If you are instead interested in changes to the collection’s membership, use the