An object that retrieves the IDs for discoverable users whose email addresses or user record IDs you already know.
- iOS 8.0–10.0Deprecated
- macOS 10.10–10.12Deprecated
- Mac Catalyst 13.0–13.0Deprecated
- tvOS 9.0–10.0Deprecated
- watchOS 3.0–3.0Deprecated
Users of an app must opt in to discoverability before their user records can be accessed. To opt in for a user, your app must call the
request method of your container object and request the
CKApplication permission. Calling that method prompts the user to grant or deny the permission.
If you assign a completion block to the
completion property of the operation object, the completion block is called after the operation executes and returns its results to you. You can use a completion block to perform housekeeping chores related to the operation, but do not use it to process the results of the operation itself. Any completion block you specify should be prepared to handle the failure of the operation to complete its task, whether due to an error or an explicit cancellation.