Need to sort on iOS by date using Parse.com but I need to order them based on the next birthday for a specific person. I tried to add the day and month with the current or next year and that helped but that will be a manual process, any recommendations to do this in an automated way.
As a side note I want to implement it in swift
Thanks all in advance.
The exact code will depend on your personal setup (I can imagine you've made a subclass of PFObject or similar), but try to experiment with the following code. I've also made another function called filterFriendsAfterBirthdays that might be useful for somebody reading this post.
//
// ViewController.swift
// ParseFun
//
// Created by Stefan Veis Pennerup on 20/06/15.
// Copyright (c) 2015 Kumuluzz. All rights reserved.
//
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
createDummyData()
queryForFriends() {
println("Unsorted birthdays: \($0)")
println("Sorted birthdays: \(self.filterFriendsAfterBirthdays($0))")
println("Closets upcoming birthday: \(self.filterFriendsBasedOnClosetsUpcomingBirthday($0))")
}
}
func createDummyData() {
for var i = 0; i < 25; i++ {
let myFriend = PFObject(className: "Friends")
let interval = Double(arc4random_uniform(UInt32.max))
myFriend["birthday"] = NSDate(timeIntervalSince1970: interval)
myFriend.saveInBackground()
}
}
func queryForFriends(completionHandler: ([PFObject]) -> ()) {
let friendsQuery = PFQuery(className: "Friends")
friendsQuery.findObjectsInBackgroundWithBlock { (result, error) in
if (error != nil) { return }
let pfArray = result as! [PFObject]
completionHandler(pfArray)
}
}
func filterFriendsAfterBirthdays(friends: [PFObject]) -> [PFObject] {
return friends.sorted {
return ($0["birthday"] as! NSDate).compare($1["birthday"] as! NSDate) == .OrderedAscending
}
}
func filterFriendsBasedOnClosetsUpcomingBirthday(friends: [PFObject]) -> [PFObject] {
let cal = NSCalendar.currentCalendar()
// Specifies the day unit
let dayUnit: NSCalendarUnit = .CalendarUnitDay
// Gets todays year
let today = NSDate()
let yearUnit: NSCalendarUnit = .CalendarUnitYear
let yearToday = cal.components(yearUnit, fromDate: today)
// Combined days and year units
let combinedUnits: NSCalendarUnit = .CalendarUnitYear | .CalendarUnitDay
return friends.sorted {
// Gets the birthday components since today
// Also uses the year unit to ensure that the day will be between -365 and 365
let birth1Components = cal.components(combinedUnits, fromDate: today, toDate: ($0["birthday"] as! NSDate), options: nil)
let birth2Components = cal.components(combinedUnits, fromDate: today, toDate: ($1["birthday"] as! NSDate), options: nil)
// Updates the days to a positive integer
if (birth1Components.day < 0) { birth1Components.day += 365 }
if (birth2Components.day < 0) { birth2Components.day += 365 }
return birth1Components.day <= birth2Components.day
}
}
}
Related
I'm trying to run a couple of for loops inside of a function that should return an array of strings.
Where I'm having trouble is with getting the correct results BEFORE the next for loop is run...and then again returning that results BEFORE I need to return the array of strings to complete the function.
In the first case, I have a for loop that's getting data from Firebase. I was able to use a dispatch group to get the value to print out - but then with the other loop after this - I was having issues from using the dispatch group in the prior task.
The code all works perfectly if executed with the correct values but I'm not sure how to go about this with regards to threading. Would really appreciate any help.
func findTopSpots() -> [String] {
var topFive = [String]()
var locationRatingDictionary = [String:Double]()
let myGroup = DispatchGroup()
let locationsArray = ["wyoming", "kansas", "arkansas", "florida", "california"]
// Use the days to find the most common month
let calendar = NSCalendar.current
var monthArray = [String]()
var date = self.departureDate!
let endDate = self.returnDate!
// Formatter for printing the month name
let fmt = DateFormatter()
fmt.dateFormat = "MMMM"
// Add each days month to an array
while date <= endDate {
date = calendar.date(byAdding: .day, value: 1, to: date)!
monthArray.append(fmt.string(from: date))
}
// Return the primary month from function
let primaryMonth = findMostCommonMonthInArray(array: monthArray).lowercased()
// Create a dictionary of location:rating for the primary month
for doc in locationsArray {
self.db.collection("locations").document(doc).collection("historic").document(primaryMonth).getDocument { (document, err) in
if let document = document, document.exists {
let rating = document["rating"] as? Double
locationRatingDictionary[doc] = rating
} else {
print("Document does not exist")
}
}
}
//---- THE CODE BELOW WILL NOT PRINT WITH ANY VALUES ----//
print(locationRatingDictionary)
// Sort the tuple array by rating
let locationRatingTupleArray = locationRatingDictionary.sorted{ $0.value > $1.value }
// Return 5 results
for (location,rating) in locationRatingTupleArray.prefix(5) {
print(location,rating)
topFive.append(location)
}
print("top five are \(topFive)")
return topFive
}
The issue here is that the firebase returns with query results asynchronously and you are not waiting for it to return.
I can see that you have instantiate DispatchGroup but have not used it. Lets try to use it to solve your issue. Also, you would need to change the method signature to take a closure. This avoids blocking thread to return function output.
func findTopSpots(completionHandler:([String])->Void) {
var topFive = [String]()
var locationRatingDictionary = [String:Double]()
let myGroup = DispatchGroup()
let locationsArray = ["wyoming", "kansas", "arkansas", "florida", "california"]
// Use the days to find the most common month
let calendar = NSCalendar.current
var monthArray = [String]()
var date = self.departureDate!
let endDate = self.returnDate!
// Formatter for printing the month name
let fmt = DateFormatter()
fmt.dateFormat = "MMMM"
// Add each days month to an array
while date <= endDate {
date = calendar.date(byAdding: .day, value: 1, to: date)!
monthArray.append(fmt.string(from: date))
}
// Return the primary month from function
let primaryMonth = findMostCommonMonthInArray(array: monthArray).lowercased()
// Create a dictionary of location:rating for the primary month
for doc in locationsArray {
myGroup.enter() self.db.collection("locations").document(doc).collection("historic").document(primaryMonth).getDocument { (document, err) in
if let document = document, document.exists {
let rating = document["rating"] as? Double
locationRatingDictionary[doc] = rating
} else {
print("Document does not exist")
}
myGroup.leave()
}
}
myGroup.notify(queue:.main) {
//---- THE CODE BELOW WILL NOT PRINT WITH ANY VALUES ----//
print(locationRatingDictionary)
// Sort the tuple array by rating
let locationRatingTupleArray = locationRatingDictionary.sorted{ $0.value > $1.value }
// Return 5 results
for (location,rating) in locationRatingTupleArray.prefix(5) {
print(location,rating)
topFive.append(location)
}
print("top five are \(topFive)")
completionHandler(topFive)
}
}
Your code is asynchronous fastest way is dispatchGroup with completion
//
func findTopSpots(completion:#escaping(_ arr:[string])->void){
let dispatchGroup = DispatchGroup()
var topFive = [String]()
var locationRatingDictionary = [String:Double]()
let locationsArray = ["wyoming", "kansas", "arkansas", "florida", "california"]
// Use the days to find the most common month
let calendar = NSCalendar.current
var monthArray = [String]()
var date = self.departureDate!
let endDate = self.returnDate!
// Formatter for printing the month name
let fmt = DateFormatter()
fmt.dateFormat = "MMMM"
// Add each days month to an array
while date <= endDate {
date = calendar.date(byAdding: .day, value: 1, to: date)!
monthArray.append(fmt.string(from: date))
}
// Return the primary month from function
let primaryMonth = findMostCommonMonthInArray(array: monthArray).lowercased()
// Create a dictionary of location:rating for the primary month
for doc in locationsArray {
dispatchGroup.enter()
self.db.collection("locations").document(doc).collection("historic").document(primaryMonth).getDocument { (document, err) in
if let document = document, document.exists {
let rating = document["rating"] as? Double
locationRatingDictionary[doc] = rating
} else {
print("Document does not exist")
}
dispatchGroup.leave()
}
}
dispatchGroup.notify(queue: .main) {
//---- THE CODE BELOW WILL NOT PRINT WITH ANY VALUES ----//
print(locationRatingDictionary)
// Sort the tuple array by rating
let locationRatingTupleArray = locationRatingDictionary.sorted{ $0.value > $1.value }
// Return 5 results
for (location,rating) in locationRatingTupleArray.prefix(5) {
print(location,rating)
topFive.append(location)
}
print("top five are \(topFive)")
completion(topFive)
}
}
I'm adding items to my Firebase with date in this format:
var date: NSDate?
override func viewDidLoad() {
super.viewDidLoad()
date = NSDate()
}
// ......
#IBAction func save(_ sender: UIBarButtonItem) {
if let realDate = date {
fullDate = "\(String(describing: realDate))"
}
// ......
let wordItem = Word(word: word, translation: translation, date: fullDate, fullDate: trueDate, exOne: exOne, exTwo: exTwo, completed: false, keyRandom: randomString)
let wordItemRef = self.ref?.child("Users").child(uid).child("LearnedWords").child(randomString)
wordItemRef?.setValue(wordItem.toAnyObject())
presentingViewController?.dismiss(animated: true, completion: nil)
}
So, my Firebase for Date looks like this:
Then, I retrieve this data in another ViewController and add it to the array:
override func viewDidLoad() {
super.viewDidLoad()
// checking if user is in
guard let uid = Auth.auth().currentUser?.uid else {
return
}
// retrieving data from FireBase
ref = Database.database().reference()
databaseHandle = ref?.child("Users").child(uid).child("LearnedWords").observe(.value, with: { (snapshot) in
var newItems: [Word] = []
for item in snapshot.children {
let wordItem = Word(snapshot: item as! DataSnapshot)
newItems.append(wordItem)
}
newItems.sort(by: { $0.date.compare($1.date) == .orderedDescending})
self.words = newItems
self.getAllMessagesSent(snapshot: newItems)
})
}
// retrieve data from Firebase to the View
func getAllMessagesSent(snapshot: [Word]) {
int = snapshot.count - 1
array = snapshot
}
The question:
How is it possible to retrieve the items from array from the nearest day? If today is 16 of August, I should get all items of the nearest day (for example, 8 items from 12 of August, if this date was the last). And should I change the way I'm adding date to Firebase to achieve this?
Edit
I achieved this by comparing the last date in the array with all other dates:
// retrieve data from Firebase to the View
var dateToCompare: String?
var array: [Word] = []
func getAllMessagesSent(snapshot: [Word]) {
int = snapshot.count - 1
array = snapshot
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MM/dd/yyyy"
dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
// get the nearest item's date and convert it to Date
dateToCompare = array[0].fullDate
let formattedDateToCompare = dateFormatter.date(from: dateToCompare!)
// make array of dates
var dateArray = [NSDate]()
var numberOfWordsThisDay = 1
// formatting all dates in the array
for i in 0..<array.count {
let date1 = dateFormatter.date(from: array[i].fullDate)
dateArray.append(date1! as NSDate)
}
// comparing and in case of cussces increase the number
for i in 1..<array.count {
if Calendar.current.compare(formattedDateToCompare!, to: dateArray[i] as Date, toGranularity: .day) == .orderedSame {
numberOfWordsThisDay += 1
}
}
self.numOfWords.placeholder = "From \(numberOfWordsThisDay) to \(array.count)"
}
It works, but it definitely doesn't look like efficient solution, because I loop over two huge arrays. Is it possible to improve my code? Thanks!
I am trying to get steps from Health Kit, its working fine for mobile but when i connect Apple Watch my app get more steps then Health kit. i trace it and find that it collect detail record of steps but total steps are less then detail in Health kit.
My App getting the sum of these steps:
But I want To Get these:
Here is My Code:
func MultipleDaysStepsAndActivitiesTest(_ startDate:Date, completion: #escaping (NSDictionary, [HealthKitManuallActivity], NSError?) -> () ) {
let type = HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount) // The type of data we are requesting
let now = Date()
let newDate = startDate
let predicate = HKQuery.predicateForSamples(withStart: newDate, end: now, options: HKQueryOptions())
var dates = now.datesBetweenGivenDates(startDate,endDate:now)
dates = dates.reversed()
let query = HKSampleQuery(sampleType: type!, predicate: predicate, limit: 0, sortDescriptors: nil) { query, results, error in
var dict:[String:Double] = [:]
if results?.count > 0 {
for result in results as! [HKQuantitySample] {
print(result)
if result.sourceRevision.source.name != kHealthKitSource {
if dict[self.fmt.string(from: result.startDate)] != nil {
dict[self.fmt.string(from: result.startDate)] = dict[self.fmt.string(from: result.startDate)]! + result.quantity.doubleValue(for: HKUnit.count())
} else {
dict[self.fmt.string(from: result.startDate)] = result.quantity.doubleValue(for: HKUnit.count())
}
}
}
}
var sDate = startDate // first date
let cal = Calendar.current
print(dict)
if dict.isEmpty {
while sDate <= Date() {
dict[self.fmt.string(from: sDate)] = 0
sDate = cal.date(byAdding: .day, value: 1, to: sDate)!
}
} else {
while sDate <= Date() {
if dict[self.fmt.string(from: sDate)] == nil {
dict[self.fmt.string(from: sDate)] = 0
}
sDate = cal.date(byAdding: .day, value: 1, to: sDate)!
}
}
// reading activities
self.MultipleDaysWorkouts(startDate, endDate: now, completion: { (activities, error) in
if results?.count == 0 {
for activity in activities {
dict[activity.startDate] = 0.0
}
}
// reading mindfulness activities
self.MultipleDayMindFullnessActivity(startDate, completion: { (mindfulnessActivities, mindError) in
if mindError == nil {
let allActivities = mindfulnessActivities + activities
completion(dict as NSDictionary, allActivities, mindError as NSError?)
}
})
})
}
execute(query)
}
You should use HKStatisticsQuery or HKStatisticsCollectionQuery instead of HKSampleQuery. The statistics queries will de-deuplicate overlapping step samples from different sources to ensure that you do not double-count them. You can find documentation for them here and here.
I'm building an app for personal use, and I am currently stuck on how to accurately get yesterdays steps from the healthkit. And then from there, placing it into a variable (should be easy, I know).
I have a HealthKitManager class that calls the function from inside a view, and then appends that to a variable from that same view.
I have scoured most of the healthKit questions, and I get back data, but I don't think it is accurate data. My phone data from yesterday is 1442 steps, but it's returning 2665 steps. On top of that, when I try to put the data is a variable it prints out as 0.
HealthKitManagerClass
import Foundation
import HealthKit
class HealthKitManager {
let storage = HKHealthStore()
init()
{
checkAuthorization()
}
func checkAuthorization() -> Bool
{
// Default to assuming that we're authorized
var isEnabled = true
// Do we have access to HealthKit on this device?
if HKHealthStore.isHealthDataAvailable()
{
// We have to request each data type explicitly
let steps = NSSet(object: HKQuantityType.quantityTypeForIdentifier(HKQuantityTypeIdentifierStepCount)!)
// Now we can request authorization for step count data
storage.requestAuthorizationToShareTypes(nil, readTypes: steps as? Set<HKObjectType>) { (success, error) -> Void in
isEnabled = success
}
}
else
{
isEnabled = false
}
return isEnabled
}
func yesterdaySteps(completion: (Double, NSError?) -> ())
{
// The type of data we are requesting (this is redundant and could probably be an enumeration
let type = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierStepCount)
// Our search predicate which will fetch data from now until a day ago
// (Note, 1.day comes from an extension
// You'll want to change that to your own NSDate
let calendar = NSCalendar.currentCalendar()
let yesterday = calendar.dateByAddingUnit(.Day, value: -1, toDate: NSDate(), options: [])
//this is probably why my data is wrong
let predicate = HKQuery.predicateForSamplesWithStartDate(yesterday, endDate: NSDate(), options: .None)
// The actual HealthKit Query which will fetch all of the steps and sub them up for us.
let query = HKSampleQuery(sampleType: type!, predicate: predicate, limit: 0, sortDescriptors: nil) { query, results, error in
var steps: Double = 0
if results?.count > 0
{
for result in results as! [HKQuantitySample]
{
steps += result.quantity.doubleValueForUnit(HKUnit.countUnit())
}
}
//I'm unsure if this is correct as well
completion(steps, error)
print("\(steps) STEPS FROM HEALTH KIT")
//this adds the steps to my character (is this in the right place)
Player.User.Gold.addSteps(Int(steps))
}
//not 100% on what this does, but I know it is necessary
storage.executeQuery(query)
}}
ViewControllerClass
import UIKit
import Foundation
class UpdateViewController: UIViewController {
#IBOutlet var back: UIButton!
let HKM = HealthKitManager()
var stepsFromPhone = Double()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
back.transform = CGAffineTransformMakeRotation(CGFloat(M_PI_2))
HKM.yesterdaySteps(){ steps, error in
self.stepsFromPhone = steps
}
Player.User.Gold.addSteps(Int(stepsFromPhone))
print(Player.User.Gold.getSteps(), "IN PLAYER")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
The output from
print(Player.User.Gold.getSteps(), "IN PLAYER")
is
0 IN PLAYER
The output from
print("\(steps) STEPS FROM HEALTH KIT")
is
2665.0 STEPS FROM HEALTH KIT
so, basically my questions are:
what NSDate() do I need for the whole of yesterday?
how do I take the steps from the yesterdaySteps() and correctly place them into a variable in the UpdateViewController?
Thank you for any help!
This is the method I am using in my healthStore class
func TodayTotalSteps(completion: (stepRetrieved: Double) -> Void) {
let type = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierStepCount) // The type of data we are requesting
let calendar = NSCalendar.currentCalendar()
let interval = NSDateComponents()
interval.day = 1
let anchorComponents = calendar.components([.Day , .Month , .Year], fromDate: NSDate())
anchorComponents.hour = 0
let anchorDate = calendar.dateFromComponents(anchorComponents)
let stepsQuery = HKStatisticsCollectionQuery(quantityType: type!, quantitySamplePredicate: nil, options: .CumulativeSum, anchorDate: anchorDate!, intervalComponents: interval)
stepsQuery.initialResultsHandler = {query, results, error in
let endDate = NSDate()
var steps = 0.0
let startDate = calendar.dateByAddingUnit(.Day, value: 0, toDate: endDate, options: [])
if let myResults = results{ myResults.enumerateStatisticsFromDate(startDate!, toDate: endDate) { statistics, stop in
if let quantity = statistics.sumQuantity(){
let date = statistics.startDate
steps = quantity.doubleValueForUnit(HKUnit.countUnit())
// print("\(date): steps = \(steps)")
}
completion(stepRetrieved: steps)
}
} else {
completion(stepRetrieved: steps)
}
}
executeQuery(stepsQuery)
}
and here is How I am using it
func getStepsData() {
// I am sendng steps to my server thats why using this variable
var stepsToSend = 0
MyHealthStore.sharedHealthStore.todayManuallyAddedSteps({ (steps , error) in
if error != nil{
// handle error
}
else{
// truncating manuall steps
MyHealthStore.sharedHealthStore.TodayTotalSteps({ (stepRetrieved) in
stepsToSend = Int(stepRetrieved - steps)
})
}
})
}
and here is the function used above for manually added steps which we are truncating in order to get exact steps
func todayManuallyAddedSteps(completion: (Double, NSError?) -> () )
{
let type = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierStepCount) // The type of data we are requesting
let date = NSDate()
let cal = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!
let newDate = cal.startOfDayForDate(date)
let predicate = HKQuery.predicateForSamplesWithStartDate(newDate, endDate: NSDate(), options: .None) // Our search predicate which will fetch all steps taken today
// The actual HealthKit Query which will fetch all of the steps and add them up for us.
let query = HKSampleQuery(sampleType: type!, predicate: predicate, limit: 0, sortDescriptors: nil) { query, results, error in
var steps: Double = 0
if results?.count > 0
{
for result in results as! [HKQuantitySample]
{
// checking and adding manually added steps
if result.sourceRevision.source.name == "Health" {
// these are manually added steps
steps += result.quantity.doubleValueForUnit(HKUnit.countUnit())
}
else{
// these are auto detected steps which we do not want from using HKSampleQuery
}
}
completion(steps, error)
} else {
completion(steps, error)
}
}
executeQuery(query)
}
I hope it helps. Let me know if you face any issue.
You can use HKStatisticsQuery
let quantityType = HKSampleType.quantityType(forIdentifier: .stepCount)!
let predicate = HKQuery.predicateForSamples(
withStart: startDate,
end: endDate,
options: [.strictStartDate, .strictEndDate]
)
let query = HKStatisticsQuery(
quantityType: quantityType,
quantitySamplePredicate: predicate,
options: .cumulativeSum) { (query, result, error) in
guard let result = result, error == nil else {
print("HeathService error \(String(describing: error))")
return
}
callback(result)
}
In my previous version of my app I stored all user data into .dat files (with NSKeyedArchiver), but in my new version I want to upgrade to a real(m) database.
I'm trying to import all of this data (and that can be a LOT) into Realm. But it's taking so much memory that the debugger eventually kill my app before the migration has finished. The 'strange' thing is that the data on hard disk is only 1.5 mb big, but it's taking memory for more than 1gb so I'm doing something wrong.
I also tried to work with multiple threads, but that didn't help. Well it speeded up the migration process (which is good), but it also took the same amount of memory.
Who can help me out? See my code below for more information..
FYI Async can be found here https://github.com/duemunk/Async
import Async
let startDate = NSDate(timeIntervalSince1970: 1388534400).startOfDay // Start from 2014 jan 1st
let endDate = NSDate().dateByAddingTimeInterval(172800).startOfDay // 2 days = 3600 * 24 * 2 = 172.800
var pathDate = startDate
let calendar = NSCalendar.currentCalendar()
let group = AsyncGroup()
var allPaths = [(Int, Int)]()
while calendar.compareDate(pathDate, toDate: endDate, toUnitGranularity: .Month) != .OrderedDescending {
// Components
let currentMonth = calendar.component(.Month, fromDate: pathDate)
let currentYear = calendar.component(.Year, fromDate: pathDate)
allPaths.append((currentYear, currentMonth))
// Advance by one month
pathDate = calendar.dateByAddingUnit(.Month, value: 1, toDate: pathDate, options: [])!
}
for path in allPaths {
group.background {
// Prepare path
let currentYear = path.0
let currentMonth = path.1
let path = (Path.Documents as NSString).stringByAppendingPathComponent("Stats_\(currentMonth)_\(currentYear).dat")
print(path)
if NSFileManager.defaultManager().fileExistsAtPath(path) {
NSKeyedUnarchiver.setClass(_OldStatisticsDataModel.self, forClassName: "StatisticsDataModel")
if let statistics = NSKeyedUnarchiver.unarchiveObjectWithFile(path) as? [_OldStatisticsDataModel] {
// Loop through days
for i in 1...31 {
let dateComponents = NSDateComponents()
dateComponents.year = currentYear
dateComponents.month = currentMonth
dateComponents.day = i
dateComponents.hour = 0
dateComponents.minute = 0
// Create date from components
let userCalendar = NSCalendar.currentCalendar() // user calendar
guard let date = userCalendar.dateFromComponents(dateComponents) else {
continue
}
// Search for order items
let filtered = statistics.filter {
if let date = $0.date {
let dateSince1970 = date.timeIntervalSince1970
return date.startOfDay.timeIntervalSince1970 <= dateSince1970 && date.endOfDay.timeIntervalSince1970 >= dateSince1970
}
return false
}
if filtered.isEmpty == false {
// Create order
let transaction = Transaction()
transaction.employee = Account.API().administratorEmployee()
let order = Order()
order.status = PayableStatus.Paid
order.createdDate = date.timeIntervalSince1970
order.paidDate = date.timeIntervalSince1970
// Loop through all found items
for item in filtered {
// Values
let price = (item.price?.doubleValue ?? 0.0) * 100.0
let tax = (item.tax?.doubleValue ?? 0.0) * 100.0
// Update transaction
transaction.amount += Int(price)
// Prepare order item
let orderItem = OrderItemm()
orderItem.amount = item.amount
orderItem.price = Int(price)
orderItem.taxPercentage = Int(tax)
orderItem.name = item.name ?? ""
orderItem.product = Product.API().productForName(orderItem.name, price: orderItem.price, tax: orderItem.taxPercentage)
// Add order item to order
order.orderItems.append(orderItem)
}
if order.orderItems.isEmpty == false {
print("\(date): \(order.orderItems.count) order items")
// Set transaction for order
order.transactions.append(transaction)
// Save the order
Order.API().saveOrders([order])
}
}
}
}
}
}
}
group.wait()
As in the comments of my question was suggested by #bdash, autoreleasepool did the trick.
I use AsyncSwift as syntactic sugar for grand central dispatch, but when using block groups the group keeps a reference to the block which caused that the memory wasn't released. I still make use of a group now but I leave the group after it's finished.
I provided my code example below, to make things clearer. Using multiple threads gave me incredibly (like 10 times faster) more performance while memory won't go above 150MB. Previously app was crashing at 1,3GB due to memory pressure.
let group = AsyncGroup()
var allPaths = [(Int, Int)]()
// Some logic to fill the paths -> not interesting
for path in allPaths {
group.enter() // The following block will be added to the group
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
autoreleasepool { // Creating an autoreleasepool to free up memory for the loaded statistics
// Stripped unnecessary stuff
if NSFileManager.defaultManager().fileExistsAtPath(path) {
// Load the statistics from .dat files
NSKeyedUnarchiver.setClass(_OldStatisticsDataModel.self, forClassName: "StatisticsDataModel")
if let statistics = NSKeyedUnarchiver.unarchiveObjectWithFile(path) as? [_OldStatisticsDataModel] {
// Loop through days
for i in 1...31 {
autoreleasepool {
// Do the heavy stuff here
}
}
}
}
}
group.leave() // Block has finished, now leave the group
}
}
group.wait()