Technologies›Health & Fitness

HealthKit

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HealthKit stores and queries the user's health and fitness data, including samples, workouts, clinical records, and characteristics. You read and write typed data such as category samples (HKCategorySample), audiogram results (HKAudiogramSample), and CDA clinical documents (HKCDADocument), and you access characteristics like biological sex and blood type through objects such as HKBiologicalSexObject and HKBloodTypeObject. To retrieve data, you run queries including HKAnchoredObjectQuery for incremental updates and HKActivitySummaryQuery to fetch activity rings via HKActivitySummary. The framework is available on iOS, macOS, watchOS, and visionOS.

Essentials 4

The central store and errors you use to read, write, and authorize access to health data.

  • Cl
    HKHealthStoreiOS 8.0+
    @class HKHealthStore
  • St
    HKErroriOS 8.0+
    An error type describing failures encountered while accessing the HealthKit store.
  • En
    HKAuthorizationStatusiOS 8.0+
    @enum HKAuthorizationStatus
  • En
    HKAuthorizationRequestStatusiOS 12.0+
    @enum HKAuthorizationRequestStatus

Objects and Sources 6

The base object model and the apps and devices that record health data.

  • Cl
    HKObjectiOS 8.0+
    The abstract base class for all data stored in HealthKit, providing a UUID, source, and metadata.
  • Cl
    HKDeletedObjectiOS 9.0+
    @class HKDeletedObject
  • Cl
    HKSourceiOS 8.0+
    @class HKSource
  • Cl
    HKSourceRevisioniOS 9.0+
    @class HKSourceRevision
  • Cl
    HKDeviceiOS 9.0+
    An object describing the hardware device that produced a sample.
  • En
    HKDevicePlacementSideiOS 14.0+
    @enum HKDevicePlacementSide

Object and Sample Types 18

The type metadata objects that identify each kind of health data you can read or write.

  • Cl
    HKObjectTypeiOS 8.0+
    @class HKObjectType
  • Cl
    HKCharacteristicTypeiOS 8.0+
    @class HKCharacteristicType
  • Cl
    HKSampleTypeiOS 8.0+
    @class HKSampleType
  • Cl
    HKCategoryTypeiOS 8.0+
    @class HKCategoryType
  • Cl
    HKCorrelationTypeiOS 8.0+
    @class HKCorrelationType
  • Cl
    HKDocumentTypeiOS 10.0+
    @class HKDocumentType
  • Cl
    HKQuantityTypeiOS 8.0+
    @class HKQuantityType
  • Cl
    HKWorkoutTypeiOS 8.0+
    @class HKWorkoutType
  • Cl
    HKSeriesTypeiOS 11.0+
    @class HKSeriesType
  • Cl
    HKActivitySummaryTypeiOS 9.3+
    @class HKActivitySummaryType
  • Cl
    HKAudiogramSampleTypeiOS 13.0+
    @class HKAudiogramSampleType
  • Cl
    HKElectrocardiogramTypeiOS 14.0+
    @class HKElectrocardiogramType
  • Cl
    HKMedicationDoseEventTypeiOS 26.0+
    @class HKMedicationDoseEventType
  • Cl
    HKPrescriptionTypeiOS 16.0+
    @class HKPrescriptionType
  • Cl
    HKScoredAssessmentTypeiOS 18.0+
    @class HKScoredAssessmentType
  • Cl
    HKStateOfMindTypeiOS 18.0+
    @class HKStateOfMindType
  • Cl
    HKUserAnnotatedMedicationTypeiOS 26.0+
    @class HKUserAnnotatedMedicationType
  • Cl
    HKClinicalTypeiOS 12.0+
    @class HKClinicalType

Type Identifiers 9

Constants that name the specific quantity, category, and other data types HealthKit recognizes.

  • St
    HKQuantityTypeIdentifier
    Constants that identify the specific quantity types HealthKit can store, such as step count or heart rate.
  • St
    HKCategoryTypeIdentifier
    Constants that identify the specific category types HealthKit can store, such as sleep analysis.
  • St
    HKCharacteristicTypeIdentifier
    Constants that identify the read-only characteristic types such as biological sex or blood type.
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    HKCorrelationTypeIdentifier
    Constants that identify the correlation types HealthKit can store, such as blood pressure.
  • St
    HKDocumentTypeIdentifier
    Constants that identify the document types HealthKit can store, such as CDA documents.
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    HKClinicalTypeIdentifieriOS 12.0+
    Constants that identify the clinical record types HealthKit can store, such as lab results.
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    HKScoredAssessmentTypeIdentifier
    Constants that identify the standardized scored assessment types HealthKit supports.
  • Cl
    HKHealthConceptIdentifieriOS 26.0+
    A unique identifier for a specific health concept within a domain.
  • St
    HKHealthConceptDomainiOS 26.0+
    A domain that represents a health concept.

Samples and Quantities 10

The sample objects and measurement values that represent recorded health data points.

  • Cl
    HKSampleiOS 8.0+
    @class HKSample
  • Cl
    HKCategorySampleiOS 8.0+
    @class HKCategorySample
  • Cl
    HKQuantityiOS 8.0+
    @class HKQuantity
  • Cl
    HKQuantitySampleiOS 8.0+
    @class HKQuantitySample
  • Cl
    HKDiscreteQuantitySampleiOS 13.0+
    @class HKDiscreteQuantitySample
  • Cl
    HKCumulativeQuantitySampleiOS 13.0+
    @class HKCumulativeQuantitySample
  • Cl
    HKCumulativeQuantitySeriesSample
    A cumulative quantity sample backed by a series of individual data points.
  • En
    HKQuantityAggregationStyleiOS 8.0+
    @enum HKQuantityAggregationStyle
  • Cl
    HKUnitiOS 8.0+
    An object representing a unit of measurement for quantity samples.
  • En
    HKMetricPrefixiOS 8.0+
    Constants specifying metric prefixes such as kilo or milli applied to a unit.

Correlations and Series 6

Grouped samples and incrementally built sample series such as heartbeat and route data.

  • Cl
    HKCorrelationiOS 8.0+
    @class HKCorrelation
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    HKSeriesSample
    @class HKSeriesSample
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    HKSeriesBuilder
    @class HKSeriesBuilder
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    HKHeartbeatSeriesSampleiOS 13.0+
    @class HKHeartbeatSeriesSample
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    HKHeartbeatSeriesBuilderiOS 13.0+
    @class HKHeartbeatSeriesBuilder
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    HKQuantitySeriesSampleBuilderiOS 12.0+
    @class HKQuantitySeriesSampleBuilder

Characteristics 10

Read-only personal characteristics such as biological sex, blood type, and skin type.

  • Cl
    HKBiologicalSexObjectiOS 8.0+
    @class HKBiologicalSexObject
  • En
    HKBiologicalSexiOS 8.0+
    @enum HKBiologicalSex
  • Cl
    HKBloodTypeObjectiOS 8.0+
    @class HKBloodTypeObject
  • En
    HKBloodTypeiOS 8.0+
    @enum HKBloodType
  • Cl
    HKFitzpatrickSkinTypeObjectiOS 9.0+
    @class HKFitzpatrickSkinTypeObject
  • En
    HKFitzpatrickSkinTypeiOS 9.0+
    @enum HKFitzpatrickSkinType
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    HKWheelchairUseObjectiOS 10.0+
    @class HKWheelchairUseObject
  • En
    HKWheelchairUseiOS 10.0+
    @enum HKWheelchairUse
  • Cl
    HKActivityMoveModeObjectiOS 14.0+
    @class HKActivityMoveModeObject
  • En
    HKActivityMoveModeiOS 14.0+
    @enum HKActivityMoveMode

Queries 9

The query classes that fetch, observe, and aggregate samples from the HealthKit store.

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    HKQueryiOS 8.0+
    The abstract base class for all HealthKit queries.
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    HKSampleQuery
    A query that returns a one-time set of samples matching a predicate.
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    HKAnchoredObjectQuery
    A query that returns incremental changes to samples since a previous anchor.
  • Cl
    HKObserverQueryiOS 8.0+
    A long-running query that notifies your app when matching samples change.
  • Cl
    HKCorrelationQueryiOS 8.0+
    @class HKCorrelationQuery
  • Cl
    HKSourceQuery
    A query that returns the sources that have saved samples of a given type.
  • Cl
    HKDocumentQueryiOS 10.0+
    @class HKDocumentQuery
  • Cl
    HKQueryAnchoriOS 9.0+
    @class HKQueryAnchor
  • En
    HKUpdateFrequencyiOS 8.0+
    @enum HKUpdateFrequency

Query Descriptors 14

Value-type descriptors and predicates for the modern async/await query interface.

  • Cl
    HKQueryDescriptoriOS 15.0+
    A value describing a sample type and predicate for use with modern query interfaces.
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    HKSamplePredicateiOS 15.4+
    A predicate for use in queries that should match a collection of `HKSample`. The generic type `Sample` indicates the
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    HKSampleQueryDescriptoriOS 15.4+
    A descriptor for an async query that returns samples matching a predicate.
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    HKAnchoredObjectQueryDescriptoriOS 15.4+
    A descriptor for an async query that returns incremental sample changes.
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    HKSourceQueryDescriptoriOS 15.4+
    A descriptor for an async query that returns matching data sources.
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    HKActivitySummaryQueryDescriptoriOS 15.4+
    A descriptor for an async query that returns daily activity summaries.
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    HKElectrocardiogramQueryDescriptoriOS 15.4+
    A descriptor for an async query that returns electrocardiogram samples.
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    HKHeartbeatSeriesQueryDescriptoriOS 15.4+
    A descriptor for an async query that returns heartbeat series data.
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    HKQuantitySeriesSampleQueryDescriptoriOS 15.4+
    A descriptor for an async query that returns the values of a quantity series sample.
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    HKWorkoutRouteQueryDescriptoriOS 15.4+
    A descriptor for an async query that returns the locations of a workout route.
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    HKAsyncQueryiOS 15.4+
    A protocol adopted by query descriptors that produce a single asynchronous result.
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    HKAsyncSequenceQueryiOS 15.4+
    A protocol adopted by query descriptors that produce an asynchronous sequence of results.
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    HKCategoryValuePredicateProvidingiOS 16.0+
    Conformers gain the ability to provide category value predicates.
  • St
    BufferedAsyncByteIteratoriOS 16.0+
    An async iterator that yields buffered bytes when reading attachment data.

Statistics 10

Computed aggregates over quantity samples for single periods or collections of intervals.

  • Cl
    HKStatisticsiOS 8.0+
    @class HKStatistics
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    HKStatisticsQuery
    A query that computes statistics over the quantity samples matching a predicate.
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    HKStatisticsCollectioniOS 8.0+
    A collection of statistics computed over a series of fixed time intervals.
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    HKStatisticsCollectionQuery
    A query that computes statistics across many time intervals, optionally updating over time.
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    HKStatisticsQueryDescriptoriOS 15.4+
    A descriptor for an async query that computes statistics over quantity samples.
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    HKStatisticsCollectionQueryDescriptoriOS 15.4+
    A descriptor for an async query that computes statistics across time intervals.
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    HKQuantitySeriesSampleQuery
    A query that returns the individual data points of a quantity series sample.
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    HKHeartbeatSeriesQuery
    A query that returns the heartbeat timings contained in a heartbeat series sample.
  • St
    HKStatisticsOptionsiOS 8.0+
    @enum HKStatisticsOptions
  • St
    HKQueryOptionsiOS 8.0+
    @enum HKQueryOptions

Activity Summaries 2

Daily activity ring data summarizing the user's Move, Exercise, and Stand goals.

  • Cl
    HKActivitySummaryiOS 9.3+
    @class HKActivitySummary
  • Cl
    HKActivitySummaryQuery
    A query that retrieves the user's daily activity summaries.

Workouts 15

Recording, configuring, and querying workout sessions, activities, and their routes.

  • Cl
    HKWorkoutiOS 8.0+
    @class HKWorkout
  • Cl
    HKWorkoutActivityiOS 16.0+
    @class HKWorkoutActivity
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    HKWorkoutEventiOS 8.0+
    @class HKWorkoutEvent
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    HKWorkoutBuilderiOS 12.0+
    @class HKWorkoutBuilder
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    HKWorkoutConfigurationiOS 10.0+
    @class HKWorkoutConfiguration
  • Cl
    HKWorkoutSessioniOS 17.0+
    @class HKWorkoutSession
  • Pr
    HKWorkoutSessionDelegateiOS 17.0+
    @enum HKWorkoutSessionStateDelegate
  • Cl
    HKWorkoutRouteiOS 11.0+
    A series sample storing the geographic route recorded during a workout.
  • Cl
    HKWorkoutRouteBuilderiOS 11.0+
    @class HKWorkoutRouteBuilder
  • Cl
    HKWorkoutRouteQuery
    A query that returns the location data contained in a workout route.
  • En
    HKWorkoutEventTypeiOS 8.0+
    Constants identifying the kinds of events that can occur during a workout.
  • En
    HKWorkoutActivityTypeiOS 8.0+
    @enum HKWorkoutActivityType
  • En
    HKWorkoutSessionLocationTypeiOS 10.0+
    @enum HKWorkoutSessionLocationType
  • En
    HKWorkoutSwimmingLocationTypeiOS 10.0+
    @enum HKWorkoutSwimmingLocationType
  • En
    HKSwimmingStrokeStyleiOS 10.0+
    @enum HKSwimmingStrokeStyle

Workout Effort and Zones 8

Relating samples to workouts and grouping their intensity into heart-rate or power zones.

  • Cl
    HKWorkoutEffortRelationshipiOS 18.0+
    An object relating samples to the workout whose effort they describe.
  • Cl
    HKWorkoutEffortRelationshipQueryiOS 18.0+
    @class HKWorkoutEffortRelationshipQuery
  • St
    HKWorkoutEffortRelationshipQueryDescriptoriOS 18.0+
    A descriptor for an async query that returns workout effort relationships.
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    HKWorkoutZone
    A value describing a single heart-rate or power zone within a workout.
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    HKWorkoutZoneConfiguration
    A value defining the boundaries used to compute a workout's zones.
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    HKWorkoutZoneDuration
    A value describing the time spent in a particular workout zone.
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    HKWorkoutZoneGroup
    A value grouping related workout zones together.
  • En
    HKPhysicalEffortEstimationTypeiOS 17.0+
    @enum HKPhysicalEffortEstimationType

Electrocardiograms and Heart Data 7

ECG samples and the enumerations describing heart-rate measurement context.

  • Cl
    HKElectrocardiogramiOS 14.0+
    @class HKElectrocardiogram
  • Cl
    HKElectrocardiogramQuery
    A query that returns the voltage measurements of an electrocardiogram sample.
  • En
    HKAppleECGAlgorithmVersioniOS 14.0+
    @enum HKAppleECGAlgorithmVersion
  • En
    HKHeartRateMotionContextiOS 11.0+
    Constants describing the user's motion state when a heart-rate sample was recorded.
  • En
    HKHeartRateRecoveryTestTypeiOS 16.0+
    @enum HKHeartRateRecoveryTestType
  • En
    HKHeartRateSensorLocationiOS 8.0+
    Constants indicating the body location of the heart-rate sensor.
  • En
    HKUserMotionContextiOS 16.0+
    Constants describing the user's motion when a sample was recorded.

Hearing Health 6

Audiogram samples and the test data describing a user's hearing sensitivity.

  • Cl
    HKAudiogramSampleiOS 13.0+
    @class HKAudiogramSample
  • Cl
    HKAudiogramSensitivityPointiOS 13.0+
    An object representing a single frequency and sensitivity measurement in an audiogram.
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    HKAudiogramSensitivityPointClampingRangeiOS 18.1+
    Defines the range within which an ear's sensitivity point may have been clamped, if any.
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    HKAudiogramSensitivityTestiOS 18.1+
    An object describing a single hearing sensitivity test for an audiogram.
  • En
    HKAudiogramConductionTypeiOS 18.1+
    @enum HKAudiogramConductionType
  • En
    HKAudiogramSensitivityTestSideiOS 18.1+
    @enum HKAudiogramSensitivityTestSide

Clinical Records 12

FHIR-backed clinical records and verifiable health documents from healthcare institutions.

  • Cl
    HKClinicalRecordiOS 12.0+
    @class HKClinicalRecord
  • Cl
    HKClinicalCodingiOS 26.0+
    A clinical coding that represents a medical concept using a standardized coding system.
  • Cl
    HKFHIRResourceiOS 12.0+
    @class HKFHIRResource
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    HKFHIRVersioniOS 14.0+
    @class HKFHIRVersion
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    HKFHIRRelease
    @abstract FHIR releases are official releases of the FHIR specification.
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    HKFHIRResourceTypeiOS 12.0+
    Constants identifying the type of a FHIR clinical resource.
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    HKVerifiableClinicalRecordiOS 15.0+
    @class HKVerifiableClinicalRecord
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    HKVerifiableClinicalRecordQuery
    A query that returns verifiable clinical records matching the given criteria.
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    HKVerifiableClinicalRecordQueryDescriptor
    A descriptor for an async query that returns verifiable clinical records.
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    HKVerifiableClinicalRecordSubjectiOS 15.0+
    @class HKVerifiableClinicalRecordSubject
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    HKVerifiableClinicalRecordSourceTypeiOS 15.4+
    Constants identifying the source standard of a verifiable clinical record.
  • St
    HKVerifiableClinicalRecordCredentialTypeiOS 15.4+
    Constants identifying the credential type of a verifiable clinical record.

Documents 3

Clinical Document Architecture (CDA) samples stored as health documents.

  • Cl
    HKDocumentSampleiOS 10.0+
    @class HKDocumentSample
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    HKCDADocumentSampleiOS 10.0+
    @class HKCDADocumentSample
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    HKCDADocumentiOS 11.0+
    An object containing the parsed contents of a CDA clinical document.

Medications 7

Medication concepts, user annotations, and logged dose events.

  • Cl
    HKMedicationConceptiOS 26.0+
    An object that describes a specific medication concept.
  • Cl
    HKMedicationDoseEventiOS 26.0+
    A sample recording an event of a medication dose being logged.
  • Cl
    HKUserAnnotatedMedicationiOS 26.0+
    A reference to the tracked medication and the details a person can customize.
  • Cl
    HKUserAnnotatedMedicationQueryiOS 26.0+
    A query that returns the user's annotated medications.
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    HKUserAnnotatedMedicationQueryDescriptoriOS 26.0+
    A descriptor for an async query that returns the user's annotated medications.
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    HKMedicationGeneralForm
    The manufactured form of a medication.
  • En
    HKInsulinDeliveryReasoniOS 11.0+
    @enum HKInsulinDeliveryReason

Vision Prescriptions 10

Eyeglasses, contact lens, and vision prescription data and their lens specifications.

  • Cl
    HKVisionPrescriptioniOS 16.0+
    @class HKVisionPrescription
  • Cl
    HKVisionPrismiOS 16.0+
    @class HKVisionPrism
  • Cl
    HKLensSpecificationiOS 16.0+
    @class HKLensSpecification
  • Cl
    HKGlassesLensSpecificationiOS 16.0+
    @class HKGlassesLensSpecification
  • Cl
    HKGlassesPrescriptioniOS 16.0+
    @class HKGlassesPrescription
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    HKContactsLensSpecificationiOS 16.0+
    @class HKContactsLensSpecification
  • Cl
    HKContactsPrescriptioniOS 16.0+
    @class HKContactsPrescription
  • En
    HKVisionPrescriptionTypeiOS 16.0+
    @enum HKVisionPrescriptionType
  • En
    HKPrismBaseiOS 16.0+
    @enum HKPrismBase
  • En
    HKVisionEyeiOS 16.0+
    @enum HKVisionEye

Mental Health and Assessments 4

State-of-mind logging and standardized clinical assessment questionnaires.

  • Cl
    HKStateOfMindiOS 18.0+
    Represents how one feels, including descriptors of a feeling and optionally, its source.
  • Cl
    HKScoredAssessmentiOS 18.0+
    @class HKScoredAssessment
  • Cl
    HKGAD7AssessmentiOS 18.0+
    Represents the result of a GAD-7 assessment. Learn more about Pfizer's GAD-7 at https://support.apple.com/en-us/105070
  • Cl
    HKPHQ9AssessmentiOS 18.0+
    Represents the result of a PHQ-9 assessment. Learn more about Pfizer's PHQ-9 at https://support.apple.com/en-us/105070

Attachments 3

Binary attachments associated with samples and the APIs to store and read them.

  • Cl
    HKAttachmentiOS 16.0+
    @class HKAttachment
  • Cl
    HKAttachmentStoreiOS 16.0+
    @class HKAttachmentStore
  • Cl
    HKAttachmentDataReaderiOS 16.0+
    The HKAttachmentDataReader class provides an interface for accessing the data of an HKAttachment object.

Category Values 21

Enumerations defining the allowed values for HealthKit's category sample types.

  • En
    HKCategoryValueiOS 9.0+
    @enum HKCategoryValue
  • En
    HKCategoryValueAppetiteChangesiOS 13.6+
    @enum HKCategoryValueAppetiteChanges
  • En
    HKCategoryValueAppleStandHouriOS 9.0+
    @enum HKCategoryValueAppleStandHour
  • En
    HKCategoryValueAppleWalkingSteadinessEventiOS 15.0+
    @enum HKCategoryValueAppleWalkingSteadinessEvent
  • En
    HKCategoryValueCervicalMucusQualityiOS 9.0+
    @enum HKCategoryValueCervicalMucusQuality
  • En
    HKCategoryValueContraceptiveiOS 14.3+
    @enum HKCategoryValueContraceptive
  • En
    HKCategoryValueEnvironmentalAudioExposureEventiOS 14.0+
    @enum HKCategoryValueEnvironmentalAudioExposureEvent
  • En
    HKCategoryValueHeadphoneAudioExposureEventiOS 14.2+
    @enum HKCategoryValueHeadphoneAudioExposureEvent
  • En
    HKCategoryValueLowCardioFitnessEventiOS 14.3+
    @enum HKCategoryValueLowCardioFitnessEvent
  • En
    HKCategoryValueMenopausalStateiOS 27.0+
    @enum HKCategoryValueMenopausalState
  • En
    HKCategoryValueMenstrualFlow
    @enum HKCategoryValueMenstrualFlow
  • En
    HKCategoryValueOvulationTestResultiOS 9.0+
    @enum HKCategoryValueOvulationTestResult
  • En
    HKCategoryValuePregnancyTestResultiOS 15.0+
    @enum HKCategoryValuePregnancyTestResult
  • En
    HKCategoryValuePresenceiOS 13.6+
    @enum HKCategoryValuePresence
  • En
    HKCategoryValueProgesteroneTestResultiOS 15.0+
    @enum HKCategoryValueProgesteroneTestResult
  • En
    HKCategoryValueSeverityiOS 13.6+
    @enum HKCategoryValueSeverity
  • En
    HKCategoryValueSleepAnalysisiOS 8.0+
    @enum HKCategoryValueSleepAnalysis
  • En
    HKCategoryValueVaginalBleedingiOS 18.0+
    @enum HKCategoryValueVaginalBleeding
  • En
    HKCategoryValueAudioExposureEvent
    @enum HKCategoryValueAudioExposureEvent
  • En
    HKAppleSleepingBreathingDisturbancesClassificationiOS 18.0+
    @enum HKAppleSleepingBreathingDisturbancesClassification
  • En
    HKAppleWalkingSteadinessClassificationiOS 15.0+
    @enum HKAppleWalkingSteadinessClassification

Measurement Context Enumerations 6

Enumerations describing the conditions and sensors under which quantity samples are recorded.

  • En
    HKBloodGlucoseMealTimeiOS 11.0+
    @enum HKBloodGlucoseMealTime
  • En
    HKBodyTemperatureSensorLocationiOS 8.0+
    Constants indicating the body location where temperature was measured.
  • En
    HKCyclingFunctionalThresholdPowerTestTypeiOS 17.0+
    @enum HKCyclingFunctionalThresholdPowerTestType
  • En
    HKVO2MaxTestTypeiOS 11.0+
    @enum HKVO2MaxTestType
  • En
    HKWaterSalinityiOS 17.0+
    @enum HKWaterSalinity
  • En
    HKWeatherConditioniOS 10.0+
    Constants describing the weather condition recorded for a workout.

Enumerations 3

  • En
    HKWorkoutEffortRelationshipQueryOptionsiOS 18.0+
    @enum HKWorkoutEffortRelationshipQueryOptions
  • En
    HKWorkoutSessionStateiOS 17.0+
    @enum HKWorkoutSessionState
  • En
    HKWorkoutSessionTypeiOS 17.0+
    @enum HKWorkoutSessionType

Type Aliases 1

  • Ty
    HKObserverQueryCompletionHandler

Extends 2

NSNotificationNotificationCenter
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