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Reading and Writing HealthKit Series Data

Share and read heartbeat and quantity series data using series builders and queries.

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Overview

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First Steps

Saving Data to HealthKit

Create and share HealthKit samples.

class HKCumulativeQuantitySample

A sample that represents a cumulative quantity.

class HKDiscreteQuantitySample

A sample that represents a discrete quantity.

class HKQuantitySample

A sample that represents a quantity, including the value and the units.

class HKCategorySample

A sample whose values are selected from a short list of possible values.

class HKCorrelation

A sample that groups multiple related samples into a single entry.

Units and Quantities

Objects used to specify a quantity for a given unit (for example, 175 lbs), and to convert between units (79.4 kg).

Metadata Keys

Constants used to add metadata to objects stored in HealthKit.