A sample that represents a discrete quantity.
- iOS 13.0+
- Mac Catalyst 13.0+
- watchOS 6.0+
A quantity sample contains one or more
HKQuantity objects. Each quantity represents a single piece of data with a single numeric value and the value’s associated units. Use these samples to store data representing independent measurements, such as height, heart rate, or temperature.
HKDiscrete class is a concrete subclass of the
HKQuantity class. Discrete quantity samples are immutable; you set the sample’s properties when you create it, and they cannot change.