HKDocumentType
A sample type used to create queries for documents.
Declaration
class HKDocumentTypeOverview
To create a document type instance, use the HKObjectType class’s documentType(forIdentifier:) convenience method.
Subclassing Notes
As with many HealthKit classes, don’t subclass document types.
Additionally, this class reuses the same instance whenever possible. Letting multiple queries share the same document type helps reduce the overall memory usage.