[iOS] HealthKit을 사용해 보자!

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*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'NSHealthUpdateUsageDescription must be set in the app's Info.plist in order to request write authorization for the following types: HKQuantityTypeIdentifierBodyMass'

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*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'NSHealthShareUsageDescription must be set in the app's Info.plist in order to request read authorization for the following types: HKQuantityTypeIdentifierStepCount, HKQuantityTypeIdentifierBodyMass'

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import HealthKit

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guard HKHealthStore.isHealthDataAvailable() else { return }

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let healthStore = HKHealthStore()

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open func requestAuthorization(toShare typesToShare: Set<HKSampleType>?, read typesToRead: Set<HKObjectType>?, completion: @escaping (Bool, Error?) -> Void)

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open class HKSampleType : HKObjectType, @unchecked Sendable {}

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open class HKObjectType : NSObject, NSSecureCoding, NSCopying, @unchecked Sendable {}

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open class func quantityType(forIdentifier identifier: HKQuantityTypeIdentifier) -> HKQuantityType?

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HKQuantityType(.stepCount)

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// 권한 요청
func requestPermissions(completion: @escaping (Bool) -> Void) {
    guard HKHealthStore.isHealthDataAvailable() else { return }

    let readTypes = Set([
        HKQuantityType(.stepCount)
    ])

    let writeTypes = Set<HKSampleType>()

    healthStore.requestAuthorization(toShare: writeTypes, read: readTypes) { bool, error in
        completion(bool)
    }
}

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`HKHealthStore`를 이용해서 execute를 통해 전체 걸음 수를 측정해 보겠습니다.

먼저 `HKSampleQuery`의 `init` 부분을 상세히 보겠습니다.
/**
     @method        initWithSampleType:predicate:limit:sortDescriptors:resultsHandler:
     @abstract      Returns a query that will retrieve HKSamples matching the given predicate.
     
     @param         sampleType      샘플 타입
     @param         predicate       조건식
     @param         limit           리턴되는 샘플의 최대 숫자(HKObjectQueryNoLimit 사용하면 제한 없음)
     @param         sortDescriptors 정렬 Descriptors
     @param         resultsHandler  excuting 되면 반환되는 핸들러
     */
    public init(sampleType: HKSampleType, predicate: NSPredicate?, limit: Int, sortDescriptors: [NSSortDescriptor]?, resultsHandler: @escaping (HKSampleQuery, [HKSample]?, Error?) -> Void)

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// 걸음 수
func readStepCount(completion: @escaping (Double) -> Void) {
    let stepType = HKQuantityType(.stepCount)
    
    let query = HKSampleQuery(sampleType: stepType, predicate: nil, limit: HKObjectQueryNoLimit, sortDescriptors: nil) { _, samples, _ in
        guard let samples = samples as? [HKQuantitySample] else {
            completion(0)
            return
        }

        // 전체 걸음 수
        let totalSteps = samples.reduce(0.0) { $0 + $1.quantity.doubleValue(for: HKUnit.count()) }
        DispatchQueue.main.async {
            completion(totalSteps)
        }
    }

    // excute를 통해 쿼리 실행
    healthStore.execute(query)
}