How to handle multiple queries of different HKQuantityTypeIdentifier - swift

Question

I'm trying to get multiple types of health data all with the same timeframe. My problem relies on the way that I should handle all the data that I get from those queries. Currently my model is as follows:
struct DailyData {
var steps: Int?
var distance: Int?
var calories: Int?
var exercise: Int?
}
class UserData {
let healthManager = HealthKitManager.shared
var dailyData = [DailyData]?
.
.
.
}
if I'm not mistaken, I can only query only one HKQuantityIdentifier at a time, so that means I need to call my getData() function from my HealthKitManager.swift once for every HKQuantityType that I have in my model:
func getData(type: HKQuantityTypeIdentifier, unit: HKUnit, days: Int, completed: #escaping (Result<[Int], Error>) -> Void) {
let calendar = NSCalendar.current
let interval = NSDateComponents()
interval.day = 1
let quantityType = HKQuantityType.quantityType(forIdentifier: type)!
var anchorComponents = calendar.dateComponents([.day, .month, .year], from: NSDate() as Date)
anchorComponents.hour = 0
let anchorDate = calendar.date(from: anchorComponents)
// Define 1-day intervals starting from 0:00
let query = HKStatisticsCollectionQuery(quantityType: quantityType,
quantitySamplePredicate: nil,
options: .cumulativeSum,
anchorDate: anchorDate!,
intervalComponents: interval as DateComponents)
query.initialResultsHandler = {query, results, error in
if let error = error {
completed(.failure(error))
return
}
let endDate = NSDate()
let startDate = calendar.date(byAdding: .day, value: -(days - 1), to: endDate as Date, wrappingComponents: false)
var completeDataArray: [Int] = []
if let myResults = results{
myResults.enumerateStatistics(from: startDate!, to: endDate as Date) { statistics, stop in
if let quantity = statistics.sumQuantity(){
let dayData = quantity.doubleValue(for: unit)
completeDataArray.append(Int(dayData))
}
}
}
completed(.success(completeDataArray))
}
healthStore.execute(query)
}
My problem is that I can't find a way to correctly set the received data into my model. Could someone point me in the right direction? I believe my model could be wrong, because as for what I have gather online, it's impossible to query multiple HKQuantityTypes in one query. Meaning that I would definitely have to set my model one [Int] of a HKtype at a time.
But with what I currently have, that would mean that when the first query returns I have to create multiple DailyData objects with almost all of the variables nil except the one I'm setting. Then, when the other queries return, I should do some array checking of dailyData matching the .count values with the one I got from the query, and that just feels wrong in my opinion. Not very elegant.
I tried another approach. Instead of having an array of a custom type, having a custom type that inside has an array of ints for every HKType that I need. But this has another problem: How could I "Keep in sync" the data from every HKType? having different arrays for every type would be, in my opinion, difficult to handle for example in a tableView. How could I set number of rows in section? Which type should I prefer? Also I would be accessing data over array indexes which may lead to bugs difficult to solve.
struct WeekData {
var steps: [Int]?
var distance: [Int]?
var calories: [Int]?
var exercise: [Int]?
}
class UserData {
let healthManager = HealthKitManager.shared
var weekData = WeekData()
.
.
.
}