iOS 8 HealthKit Santiapps Marcio Valenzuela

Saving HealthKit Data & Closures

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This code bit saves: healthKitStore.saveObject(bmiSample, withCompletion: { (success, error) -> Void in if( error != nil ) { println(“Error saving BMI sample: \(error.localizedDescription)”) } else { println(“BMI sample saved successfully!”) } }) The method signature is: saveObject(object: HKObject!, withCompletion completion: ((Bool, NSError!) -> Void)!) This method takes an HKObject which is bmiSample and it takes a completion closure which itself takes a bool & error and returns void. So in our method call, we pass in the bmiSample as the HKObject and for the success and error completion block we say: if error is NOT nil then log that error’s description, else log that the bmiSample was saved successfully.  … Read More

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HealthKit for iOS8: Part 7

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4. CoreData for other non-health stats You made it to the end!  Ok, so we are basically going to be adding another store to our app and reading and writing data to THAT store as well. First let’s add a new tab and make it a UITableViewController as well.  It will have dynamically populated cells. Now embed it!   Your final storyboard should look like this:   Add a new Swift class called Swimming Data and set that new UITableViewController scene to its class.  Make that class file look like this: import Foundation import UIKit class SwimmingData: UITableViewController { } Now we must add CoreData.  To do this we need to… Read More

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HealthKit for iOS8: Part 6

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Here is the start of our WorkOut view controller: import Foundation import UIKit import HealthKit class WorkoutViewController: UITableViewController, UITextFieldDelegate { @IBOutlet var numberOfLapsTextField: UITextField! @IBOutlet var metersPerLapTextField: UITextField! @IBOutlet var workoutDurationTextField: UITextField! @IBOutlet var paceTextField: UITextField! var numberOfLapsValue: NSString? var metersPerLapValue: NSString? var workoutDurationValue: NSString? var userWeight: Double? var  healthStore:HKHealthStore? } We import what we need, we subclass UITableViewController and add the Text Field delegate protocol.  Here I have created 4 labels for: numberOfLaps metersPerLap workoutDuration pace These labels have an underlying variable for each.  The reason the first 3 are strings is because these are not health kit data per se.  These will be stored in CoreData.  However they… Read More

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HealthKit for iOS8: Part 5

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Jumping right in, our Energy view controller class starts out like this: import Foundation import UIKit import HealthKit class EnergyViewController: UITableViewController { var energyFormatter: NSEnergyFormatter { var energyFormatter: NSEnergyFormatter? var onceToken: dispatch_once_t = 0 dispatch_once(&onceToken, { energyFormatter = NSEnergyFormatter() energyFormatter?.unitStyle = NSFormattingUnitStyle.Long energyFormatter?.forFoodEnergyUse = true energyFormatter?.numberFormatter.maximumFractionDigits = 2 }) return energyFormatter! } // No required initWithCoder pasted in… var  healthStore:HKHealthStore? @IBOutlet weak var activeEnergyBurnedValueLabel: UILabel? @IBOutlet weak var restingEnergyBurnedValueLabel: UILabel? @IBOutlet weak var consumedEnergyValueLabel: UILabel? @IBOutlet weak var netEnergyValueLabel: UILabel? var activeEnergyBurned: Double = 0 var restingEnergyBurned: Double = 0 var consumedEnergy: Double = 0 var netEnergy: Double = 0 } We take care of our imports, subclass UITableViewController, create… Read More

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HealthKit for iOS8: Part 3

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Great!  Now let’s move on to the Journal View Controller.  It’ll be a good relax! 🙂 Ok we start out importing the frameworks we need: import UIKit import HealthKit Ok now let’s declare our class properties: class JournalViewController: UITableViewController {     let JournalViewControllerTableViewCellReuseIdentifier: NSString = “Cell”     var foodItems: NSMutableArray?     var energyFormatter: NSEnergyFormatter {         var energyFormatter: NSEnergyFormatter?         var onceToken: dispatch_once_t = 0         dispatch_once(&onceToken, {             energyFormatter = NSEnergyFormatter()             energyFormatter?.unitStyle = NSFormattingUnitStyle.Long             energyFormatter?.forFoodEnergyUse = true      … Read More

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Swift Closures Quick Reference: Part 3

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Now let’s write our own closure! func fetchMostRecentDataOfQuantityType(quantityType: HKQuantityType, withCompletion completion: ((mostRecentQuantity:HKQuantity?, error:NSError?) -> ())? ) { let timeSortDescriptor = NSSortDescriptor(key: HKSampleSortIdentifierEndDate, ascending: false) [timeSortDescriptor], resultsHandler: { (query:HKSampleQuery!, results:[AnyObject]!, error:NSError?) -> Void in let query = HKSampleQuery(sampleType: quantityType, predicate: nil, limit: 1, sortDescriptors: [timeSortDescriptor]) { query, results, error in if completion != nil && error != nil { completion!(mostRecentQuantity: nil, error: error) return; } let resultsArray = results as NSArray? var quantitySample: HKQuantitySample? = resultsArray?.firstObject as HKQuantitySample? var quantity: HKQuantity? = quantitySample?.quantity if completion != nil { completion!(mostRecentQuantity: quantity, error: error) } } self.healthStore?.executeQuery(query) } Notice we declare a function that takes a quantityType parameter and a completion parameter.  The… Read More

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iOS 8 HealthKit Santiapps Marcio Valenzuela

HealthKit for iOS8: Part 4

marskoko1 Comment

Ok so the Journal view controller was quite simple.  Let’s take another quick break by looking at an even simpler view controller, the FoodPicker: import Foundation import UIKit import HealthKit class FoodPickerViewController: UITableViewController { var selectedFoodItem: FoodItem? let FoodPickerViewControllerTableViewCellIdentifier:NSString = “cell” let FoodPickerViewControllerUnwindSegueIdentifier:NSString = “FoodPickerViewControllerUnwindSegueIdentifier” var foodItems: NSArray = NSArray() var energyFormatter: NSEnergyFormatter { var energyFormatter: NSEnergyFormatter? var onceToken: dispatch_once_t = 0 dispatch_once(&onceToken, { energyFormatter = NSEnergyFormatter() energyFormatter?.unitStyle = NSFormattingUnitStyle.Long energyFormatter?.forFoodEnergyUse = true energyFormatter?.numberFormatter.maximumFractionDigits = 2 }) return energyFormatter! } var  healthStore:HKHealthStore? } Here we are looking at imports, subclassing UITableViewController and property declarations. Our first property is selectedFoodItem, which will be set to whatever value the user selects from… Read More

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Swift Closures Quick Reference: Part 2

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Let’s analyze some useful applications of closures in everyday code! Ok so let’s take a look at a real life function that uses a closure.  A typical closure is a completion handler.  A completion handler is a parameter, just like any other, that is passed into a function as a closure.  When that code gets executed, the completion handler gets filled.  Then your function will use the value of that completion handler to do something useful. Here are some typical uses of closures in API’s.  The typical one is UIView.animateWithDuration.  Open Xcode and start writing UIView.anim… and it will autocomplete for you with this: UIView.animateWithDuration(<duration: NSTimeInterval>, animations: <() -> Void()… Read More

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Swift Closures Quick Reference: Part 1

marskokoNo Comments

Blocks/Closures are confusing!  They’re confusing because its a bit abstract.  Most tutorials cover how a block is declared and used. Sometimes blocks or closures can me even more confusing… A block is a bunch of code wrapped up in a {}. You can 2 either of 2 things with them: A.  You can assign that block of code to a variable. (this is where completionHandlers, also a confusing concept, fit in) B.  You can use that block of code directly Let’s take a look at assigning it to something.  No doubt you have seen a construct like: var someName = “Mars” or var hisAge = 39 This would be considered hardcoding… Read More

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iOS : Swift : Blocks = Closures

marskoko3 Comments

I’ve never really liked blocks in ObjC. When Swift came out it made things more complicated for me because I’ve never really liked C either. Finally when I had to deal with closures in Swift, well that’s just gonna piss a lot of people off! After a few days reviewing tons of material online, and I mean TONS!  I came to understand this: The only C-like exposure I had prior to ObjC was a little PHP.  So that allows me to understand a function, which is the equivalent of a method in ObjC: DECLARING func sayHello( ) {      println(“Hello World”) } CALLING sayHello( ) RESULT Hello World Even… Read More

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