Code Snippet For http://vichudson1.micro.blog/2018/05/26/health-up-diaries.html

OriginalCode.swift

public typealias QuantitySampleQueryResultsHandler = (_ query: HKSampleQuery, _ samples: [HKQuantitySample]) -> Void
public typealias CategorySampleQueryResultsHandler = (_ query: HKSampleQuery, _ samples: [HKCategorySample]) -> Void

func quantitySampleQuery(startDate: Date,
                         endDate: Date?,
                         dateOptions: HKQueryOptions = [.strictStartDate, .strictEndDate],
                         sampleType: HKQuantityType,
                         resultsLimit: Int = Int(HKObjectQueryNoLimit),
                         resultsHandler: @escaping QuantitySampleQueryResultsHandler) -> HKSampleQuery {
    
    // Build sort descriptor to return the samples in descending order
    let sortDescriptor = NSSortDescriptor(key:HKSampleSortIdentifierStartDate, ascending: false)
    
    // Limit the number of samples returned by the query to the number requested
    let limit = resultsLimit
    
    let datePredicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: dateOptions)
    
    // Build the query
    let query = HKSampleQuery(sampleType: sampleType, predicate: datePredicate, limit: limit, sortDescriptors: [sortDescriptor]) {
        (sampleQuery, results, error ) -> Void in
        guard let samples = results as? [HKQuantitySample] , error == nil else {
            resultsHandler(sampleQuery, [])
            guard let queryError = error else { return }
            print("\(queryError.localizedDescription)")
            return
        }
        resultsHandler(sampleQuery, samples)
    }
    return query
}

func categorySampleQuery(startDate: Date,
                         endDate: Date,
                         sampleType: HKCategoryType,
                         resultsLimit: Int = Int(HKObjectQueryNoLimit),
                         resultsHandler: @escaping CategorySampleQueryResultsHandler) -> HKSampleQuery {
    
    // Build sort descriptor to return the samples in descending order
    let sortDescriptor = NSSortDescriptor(key:HKSampleSortIdentifierStartDate, ascending: false)
    
    // Limit the number of samples returned by the query to the number requested
    let limit = resultsLimit
    
    let datePredicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: [.strictStartDate, .strictEndDate])
    
    // Build the query
    let query = HKSampleQuery(sampleType: sampleType, predicate: datePredicate, limit: limit, sortDescriptors: [sortDescriptor]) {
        (sampleQuery, results, error ) -> Void in
        guard let samples = results as? [HKCategorySample] , error == nil else {
            resultsHandler(sampleQuery, [])
            guard let queryError = error else { return }
            print("\(queryError.localizedDescription)")
            return
        }
        resultsHandler(sampleQuery, samples)
    }
    return query
}