My watchos app relies on haptic feedback working in the background. I have searched and searched over the internet on how to do this and have only learnt how to add things to my info.plist
I do not want to use notifications to alert my user as its to cumbersome in terms of UI because this would be done too often.
I read about workout sessions but can't get this to work.
How do I allow haptic feedback to work while the wrist is lowered? The simplest way will be enough and I am not the most advanced with swift so please try explain fully!
An example of my code is below. Please show me where to put it if I want background haptic feedback to work:
My timer:
_ = Timer.scheduledTimer(timeInterval: 88, target: self, selector: "action", userInfo: nil, repeats: true)
My action:
func action() {
print("action")
WKInterfaceDevice.current().play(.success)
imageObject.setImageNamed("number2")
}
This is what I'm doing with HKWorkout session but have absolute no idea whats going on.
func workoutSession(_ workoutSession: HKWorkoutSession, didChangeTo toState: HKWorkoutSessionState, from fromState: HKWorkoutSessionState, date: Date) {
switch toState {
case .running:
workoutDidStart(date)
case .ended:
workoutDidEnd(date)
default:
print("Unexpected state \(toState)")
}
}
func workoutSession(_ workoutSession: HKWorkoutSession, didFailWithError error: Error) {
// Do nothing for now
print("Workout error")
}
func workoutDidStart(_ date : Date) {
if let query = createHeartRateStreamingQuery(date) {
self.currenQuery = query
healthStore.execute(query)
} else {
label.setText("cannot start")
}
}
func workoutDidEnd(_ date : Date) {
healthStore.stop(self.currenQuery!)
label.setText("---")
session = nil
}
// MARK: - Actions
@IBAction func startBtnTapped() {
if (self.workoutActive) {
//finish the current workout
self.workoutActive = false
self.startStopButton.setTitle("Start")
if let workout = self.session {
healthStore.end(workout)
}
} else {
//start a new workout
self.workoutActive = true
self.startStopButton.setTitle("Stop")
_ = Timer.scheduledTimer(timeInterval: 5, target: self, selector: "firsts", userInfo: nil, repeats: false)
startWorkout()
}
}
func startWorkout() {
// If we have already started the workout, then do nothing.
if (session != nil) {
return
}
// Configure the workout session.
let workoutConfiguration = HKWorkoutConfiguration()
workoutConfiguration.activityType = .crossTraining
workoutConfiguration.locationType = .indoor
do {
session = try HKWorkoutSession(configuration: workoutConfiguration)
session?.delegate = self
} catch {
fatalError("Unable to create the workout session!")
}
healthStore.start(self.session!)
}
func createHeartRateStreamingQuery(_ workoutStartDate: Date) -> HKQuery? {
guard let quantityType = HKObjectType.quantityType(forIdentifier: HKQuantityTypeIdentifier.heartRate) else { return nil }
let datePredicate = HKQuery.predicateForSamples(withStart: workoutStartDate, end: nil, options: .strictEndDate )
//let devicePredicate = HKQuery.predicateForObjects(from: [HKDevice.local()])
let predicate = NSCompoundPredicate(andPredicateWithSubpredicates:[datePredicate])
let heartRateQuery = HKAnchoredObjectQuery(type: quantityType, predicate: predicate, anchor: nil, limit: Int(HKObjectQueryNoLimit)) { (query, sampleObjects, deletedObjects, newAnchor, error) -> Void in
//guard let newAnchor = newAnchor else {return}
//self.anchor = newAnchor
self.updateHeartRate(sampleObjects)
}
heartRateQuery.updateHandler = {(query, samples, deleteObjects, newAnchor, error) -> Void in
//self.anchor = newAnchor!
self.updateHeartRate(samples)
}
return heartRateQuery
}
func updateHeartRate(_ samples: [HKSample]?) {
guard let heartRateSamples = samples as? [HKQuantitySample] else {return}
DispatchQueue.main.async {
guard let sample = heartRateSamples.first else{return}
let value = sample.quantity.doubleValue(for: self.heartRateUnit)
self.label.setText(String(UInt16(value)))
// retrieve source from sample
let name = sample.sourceRevision.source.name
self.updateDeviceName(name)
self.animateHeart()
}
}
func updateDeviceName(_ deviceName: String) {
deviceLabel.setText(deviceName)
}
func animateHeart() {
self.animate(withDuration: 0.5) {
self.heart.setWidth(60)
self.heart.setHeight(90)
}
let when = DispatchTime.now() + Double(Int64(0.5 * double_t(NSEC_PER_SEC))) / Double(NSEC_PER_SEC)
DispatchQueue.global(qos: .default).async {
DispatchQueue.main.asyncAfter(deadline: when) {
self.animate(withDuration: 0.5, animations: {
self.heart.setWidth(50)
self.heart.setHeight(80)
}) }
}
}
Look I don't even need heart rate data or anything at all but the taptic engine buzzing in the background.
