Quantity types identify samples that store numerical values.
SDKs
Framework
The HKQuantity class is a concrete subclass of the HKObject class. To create a quantity type instance, use the object type’s quantity convenience method.
Use quantity types to:
Request permission to read or write matching quantity samples.
Create and share matching quantity samples.
Query for matching quantity samples.
var aggregationThe aggregation style for the given quantity type.
enum HKQuantityConstant values that describe how quantities can be aggregated over time.
func `is`(compatibleReturns a Boolean value that indicates whether the quantity type is compatible with the given unit.
class HKCharacteristicCharacteristic types represent data that does not typically change over time.
class HKCategoryCategory types identify samples that contain a value from a small set of possible values.
class HKCorrelationCorrelation types identify samples that group multiple subsamples.
class HKActivityActivity summary types identify activity summary objects.
class HKSeriesAn identifier that indicates the type for data stored in a series sample.
class HKObjectThe abstract superclass for all classes that identify a specific type of data when working with the HealthKit store.
class HKSampleAn abstract superclass for all classes that identify a specific type of sample when working with the HealthKit store.
class HKClinicalClinical types identify samples that contain clinical record data.