Returns a Boolean value that indicates whether the enumeration of all contacts matching a contact fetch request executed successfully.
- iOS 9.0+
- macOS 10.11+
- watchOS 2.0+
The contact fetch request that specifies the search criteria.
Error information, if an error occurred.
Called for each contact matching the fetch request.
true if enumeration of all contacts matching a contact fetch request executes successfully; otherwise,
This method waits until the enumeration is finished. If there are no results, the block is not called and the method returns
This method can fetch all contacts without keeping all of them at once in memory, which is expensive.