WWDC Afterparty Roppongi

1. Howto make
workoutapp
for watchOS 2
Mercari Inc.
@kitasuke

8. HealthKit

9. “Apps can useto
share healthand
fitness data”
HealthKit Framework Reference

10. Sample Objects
» Characteristics
» Samples
» Category Samples
» Quantity Samples
» Correlations
» Workouts

11. Main flowforworkoutapps
» Start workout session
» Query data in HealthKit
» Stop workout session
» Save data in HealthKit

12. What'sWorkoutSession
» Workout sessions allow apps to run in the
foreground
» Apple Watch can only run one workout session at a
time

13. WorkoutSession
class HKWorkoutSession: NSObject {
var activityType: HKWorkoutActivityType { get }
var locationType: HKWorkoutSessionLocationType { get }
weak var delegate: HKWorkoutSessionDelegate?
var state: HKWorkoutSessionState { get }
init(activityType: HKWorkoutActivityType,
locationType: HKWorkoutSessionLocationType)
}

14. WorkoutActivityType
enum HKWorkoutActivityType : UInt {
case Basketball
case Fishing
case Gymnastics
case Hunting
case MartialArts
case Running
case Soccer
case Swimming
case Walking
case Yoga
…
case Other
}

15. WorkoutLocationType
enum HKWorkoutSessionLocationType : Int {
case Unknown
case Indoor
case Outdoor
}

16. WorkoutSession delegate
protocol HKWorkoutSessionDelegate : NSObjectProtocol {
func workoutSession(workoutSession: HKWorkoutSession,
didChangeToState toState: HKWorkoutSessionState,
fromState: HKWorkoutSessionState, date: NSDate)
func workoutSession(workoutSession: HKWorkoutSession,
didFailWithError error: NSError)
}

17. Startingand StoppingWorkout
Sessions
healthStore.startWorkoutSession(workoutSession) {
(result: Bool, error: NSError?) -> Void in
}
healthStore.stopWorkoutSession(workoutSession) {
(result: Bool, error: NSError?) -> Void in
}

18. Setupfor HealthKit
1.Enable capabilities in Xcode
2.Check availability
3.Instantiate an HKHealthStore object
4.Request authorization

19. WatchKit Extension
let healthStore = HKHealthStore()
if HKHealthStore.isHealthDataAvailable() {
let energy = HKQuantityTypeIdentifierActiveEnergyBurned)!
let walkingRunning = HKQuantityTypeIdentifierDistanceWalkingRunning)!
let heartRate = HKQuantityTypeIdentifierHeartRate)!
let cycling = HKQuantityTypeIdentifierDistanceCycling)!
let typesToShare = Set([HKWorkoutType.workoutType()])
let typesToRead = Set([
HKObjectType.quantityTypeForIdentifier(energy,
HKObjectType.quantityTypeForIdentifier(walkingRunning,
HKObjectType.quantityTypeForIdentifier(heartRate,
HKObjectType.quantityTypeForIdentifier(cycling
])
healthStore.requestAuthorizationToShareTypes(typesToShare,
readTypes: typesToRead,
completion: { (result: Bool, error: NSError?) -> Void in
})
}

20. Containing iOS app
func applicationShouldRequestHealthAuthorization(application: UIApplication) {
HKHealthStore().handleAuthorizationForExtensionWithCompletion {
(result: Bool, error: NSError?) -> Void in
}
}

23. Accessing HealthKitData
» Direct method calls
» Sample query
» Observer query
» Anchored object query
» Statistics query
» Statistics collection query
» Correlation query
» Source query

24. Streaming Updates
let predicate = HKQuery.predicateForSamplesWithStartDate(startDate, endDate: nil, options: .None)
let type = HKObjectType.quantityTypeForIdentifier(HKQuantityTypeIdentifierDistanceCycling)!
let distanceQuery = HKAnchoredObjectQuery(type: type, predicate: predicate, anchor: 0, limit: 0) {
(query, samples, deletedObjects, anchor, error) -> Void in
}
distanceQuery.updateHandler = {
(query, samples, deletedObjects, anchor, error) -> Void in
}
healthStore.executeQuery(distanceQuery)

25. Savingworkout
let workout = HKWorkout(activityType: activityType,
startDate: startDate,
endDate: endDate,
duration: endDate.timeIntervalSinceDate(startDate),
totalEnergyBurned: totalEnergyBurned,
totalDistance: totalDistance,
metadata: nil)
healthStore.saveObject(workout) {
(result: Bool, error: NSError?) -> Void in
}

26. Howto Debug
Better debug on device, not simulator
Because
- Setting location to City Run or City Bicycle Ride
doesn't work for HealthKit
- Need to save data in HealthKit manually
- Big behavior differences between device and
simulator

27. Known Issues?

28. Can notattachto process on
device
“Did the 'trust this computer' diaglog ever show on
the watch? Unpairing and then re-pairing and
restarting Xcode should have gotten you that prompt.
The symptoms you are experiencing seem to indicate
that this dialog was not presented after you
upgraded.”
On device watchOS debugging impossible

29. WorkoutSession doesn'tkeepin
the foreground
Might be a bug?
HKWorkoutSession and keeping the app in the
foreground
Having a workout count toward green exercise ring

30. InfrequentUpdates
updateHandler is not stable?
HKWorkoutSession with HKAnchoredObjectQuery has very
infrequent updates

31. Batteryuse
Not particularly workout app issue, but should be
well-considered
Battery Use Worse

32. Summary
» Can access to a bunch of fitness information
» Customizable for specific use
» So much pain to debug

33. Thankyou