Call something when step count is updated

Question

Right now, I'm trying to set up my app so that a function is called when the user updates their step count. So far, I have the following code:

let steps: HKObjectType = HKObjectType.quantityType(forIdentifier: .stepCount)!
    if healthStore.authorizationStatus(for: steps) != HKAuthorizationStatus.notDetermined {
        healthStore.enableBackgroundDelivery(for: steps, frequency: .immediate, withCompletion: { (worked, error) in
            //registers for background data
            if error != nil {
                print(error)
            }
        })
        let sampleType = HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!
        let query = HKObserverQuery(sampleType: sampleType, predicate: nil) {
            query, completionHandler, error in

            if error != nil {
                print(error)
                abort()
            }

            // Take whatever steps are necessary to update your app's data and UI
            // This may involve executing other queries
            self.getSteps(completion: { (stepCount) in
                print("Step count was updated to \(stepCount)")
            })
            completionHandler()
        }

        healthStore.execute(query)
    }

However, this isn't called when the user's stepCount is updated in the background, although the getSteps method does work when in the foreground. Am I going about this correctly, or is what I'm trying to do just not possible?

It might be possible in for delivery in background as long as the device is unlocked... Please check out this answer for more info particularly Victor Sigler's answer https://stackoverflow.com/questions/26375767/healthkit-background-delivery-when-app-is-not-running? — Louis Leung, Nov 07 '17 at 21:32

score 2 · Accepted Answer · answered Dec 01 '17 at 02:29

2

Your code looks correct. Are you running it on a simulator instead of a real device? I have had this problem recently and background delivery does not work at all in simulator but it works in a real device

answered Dec 01 '17 at 02:29

lzt

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6

Call something when step count is updated

1 Answers1