The value that uniquely identifies the searchable item within your app.
- iOS 9.0+
- macOS 10.13+
- Mac Catalyst 13.0+Beta
- Core Spotlight
This property is required because it’s the only way to identify searchable items in the index when you need to access or delete them. When you create a searchable item, the system generates a UUID by default, but you can replace the default value with a unique identifier that makes sense in the context of your app. If you want to use a custom value for
unique, be sure to set it before the item is indexed for the first time.