watchOS didUpdateLocation freezes during location change - swift

Question

I am developing a running app in SwiftUI for watchOS. The problem is that when I start the run, the measuring works fine as 0.55 0.56 0.57 km, etc. Then it randomly freezes, and jumps from 0.57 straight to 0.71. Even the total distance is sometimes inaccurate. When I look at the map of the run, I can sometimes see sharp corners and straight lines in curves, implying very inaccurate measurement. The OS is watchOS 8.0. I have tried kCLLocationAccuracyBest to no avail.
I have used CLLocationManager in an ObservableObject called DistanceObservable, and I have this exact code in iOS app that measures the distance perfectly.
... #Published var distance: Double = 0.0
func startUpdate() {
self.manager = CLLocationManager()
self.manager?.delegate = self
self.manager?.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
self.manager?.requestWhenInUseAuthorization()
self.manager?.distanceFilter = 10.0
self.manager?.allowsBackgroundLocationUpdates = true
self.manager?.startUpdatingLocation()
}
Here is my watchOS didUpdateLocations method.
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
var locations = locations
for newLocation in locations {
let howRecent = newLocation.timestamp.timeIntervalSinceNow
guard newLocation.horizontalAccuracy < 20 && abs(howRecent) < 10 else { continue }
if let lastLocation = locationList.last {
let delta = newLocation.distance(from: lastLocation)
if (delta < 60) { // To prevent inaccurate "jumps" in distance
distance = distance + delta
if UserDefaults.standard.value(forKey: "hasSet") as!Bool == false {
distance = 0
locations.removeAll()
UserDefaults.standard.setValue(true, forKey: "hasSet")
}
latPoints.append(Double(locationList.last!.coordinate.latitude))
lonPoints.append(Double(locationList.last!.coordinate.longitude))
}
}
locationList.append(newLocation)
}
}
Finally I use the #EnvironmentObject in a SwiftUI View.
struct MyView: View {
#EnvironmentObject var loc: DistanceObservable
var body: some View {
Text("\(loc.distance)")
}
}

Answer 1

I have solved the issue by starting new HealthKit workout.
import HealthKit
Add conformance to ObservableObject and its methods
class SwiftUILocation: NSObject, CLLocationManagerDelegate, ObservableObject, HKWorkoutSessionDelegate, HKLiveWorkoutBuilderDelegate {
func workoutBuilder(_ workoutBuilder: HKLiveWorkoutBuilder, didCollectDataOf collectedTypes: Set<HKSampleType>) {
print("A")
}
func workoutBuilderDidCollectEvent(_ workoutBuilder: HKLiveWorkoutBuilder) {
print("B")
}
func workoutSession(_ workoutSession: HKWorkoutSession, didChangeTo toState: HKWorkoutSessionState, from fromState: HKWorkoutSessionState, date: Date) {
print("C")
}
func workoutSession(_ workoutSession: HKWorkoutSession, didFailWithError error: Error) {
print("D")
}
//.. rest of the code
}
Start HealthKit at the start of the workout
func startHealtKit(){
let configuration = HKWorkoutConfiguration()
configuration.activityType = .running
configuration.locationType = .outdoor
do {
self.workoutSession = try HKWorkoutSession(healthStore: healthStore,
configuration:configuration)
self.builder = self.workoutSession?.associatedWorkoutBuilder()
self.builder?.dataSource = HKLiveWorkoutDataSource(healthStore: healthStore,
workoutConfiguration: configuration)
self.workoutSession?.delegate = self
self.builder?.delegate = self
self.workoutSession?.startActivity(with: Date())
self.builder?.beginCollection(withStart: Date()) { (success, error) in
// Indicate that the session has started.
}
}
catch {
print("HealthKit problem \(error.localizedDescription)")
}
}
Stop HealtkKit at the end of the workout
func stopHealthKit(){
self.builder?.workoutSession?.stopActivity(with: Date())
self.builder?.endCollection(withEnd: Date()) { (success, error) in
// Indicate that the session has started.
}
}