Returns a predicate that matches all the objects that were created by the provided source.
- iOS 8.0+
- watchOS 2.0+
The source that saved data into the HealthKit store. The source object represents either an app or a devices capable of saving data directly into the HealthKit store (for example, a linked Bluetooth heart rate monitor).
A predicate that matches all the objects created by the provided source.
Use this convenience method to create a predicate that finds all the objects from a specific app or device. The following sample uses both the convenience method and a predicate format string to create equivalent predicates.