BaseQuery.swift

private func baseSampleQuery(from startDate: Date,
                             to endDate: Date?,
                             with options: HKQueryOptions = [.strictStartDate, .strictEndDate],
                             for sampleType: HKQuantityType,
                             limitingResultsTo limit: Int = Int(HKObjectQueryNoLimit),
                             using resultsHandler: @escaping BaseSampleQueryResultsHandler) -> HKSampleQuery  {
    
    // Build sort descriptor to return the samples in descending order
    let sortDescriptor = NSSortDescriptor(key:HKSampleSortIdentifierStartDate, ascending: false)
    
    let datePredicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: options)
    
    // Build the query
    let query = HKSampleQuery(sampleType: sampleType, predicate: datePredicate, limit: limit, sortDescriptors: [sortDescriptor]) {
        (sampleQuery, results, error ) -> Void in
        guard error == nil, let results = results else {
            guard let error = error else { return resultsHandler(sampleQuery, BaseSampleResult.failure(HealthUpQueryError.undefinedError)) }
            return resultsHandler(sampleQuery, BaseSampleResult.failure(error))
        }
        resultsHandler(sampleQuery, .success(results))
    }
    return query
}