Tukukkk

I've had a long running problem of receiving this error from HealthKit when attempting to "modify" an HKWorkout by (1) copying an existing workout (2) updating the metadata (3) deleting the "old" workout (selectedWorkout in my code below) then (4) saving the new modified workout. 98% of the time this code works flawlessly, however 2% of the time I will get this error and I end up with duplicate workouts. Am I doing anything wrong?

As an aside I really wish HealthKit would let us modify data so that this dance wasn't necessary.

class func updateMetadataDeleteOldAndSaveNewWorkout(selectedWorkout: HKWorkout, handler: @escaping (Bool,WorkoutManagerError? ) -> Void) {   



    //configure metadata   



    //  Create a new workout with the old workout's fields and new edited metadata object

                let newWorkout = HKWorkout(activityType: selectedWorkout.workoutActivityType, start: selectedWorkout.startDate, end: selectedWorkout.endDate, duration: selectedWorkout.duration, totalEnergyBurned: selectedWorkout.totalEnergyBurned, totalDistance: selectedWorkout.totalDistance, metadata: metadata)



                // Delete the old workout

                HealthStoreSingleton.sharedInstance.healthStore.delete(selectedWorkout, withCompletion: { (success, error) in



                    DispatchQueue.main.async {



                     if let unwrappedError = error  {

                         handler(false, WorkoutManagerError.deleteError(unwrappedError.localizedDescription))

                        return 

                     }

                    }



                    //  When delete was successful save the new workout

                    HealthStoreSingleton.sharedInstance.healthStore.save(newWorkout) { success, error in



                        DispatchQueue.main.async {

                            if let unwrappedError = error {

                                handler(false, WorkoutManagerError.saveError(unwrappedError.localizedDescription))

                                return 

                            }



                            if success {



                                handler(true, nil)

                                return 

                            } else {

                                  handler(false, WorkoutManagerError.saveError("(String(describing: error))"))

                                  return 

                            }

                        }

                    }

                })