CODEWITHSUNDEEP
iosswiftswift3healthkithkhealthstore
o1xhack
o1xhack

Reputation: 97

Delete health data that was previous stored from the same app in Swift?

Update Oct 7th

So after I read the answer, I now understand that I need to using query to retrive the data in Health and I try to using with codes:

let deletedType = HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.dietaryCaffeine)
    let predicate = HKQuery.predicateForSamples(withStart: dataDate as Date, end: dataDate as Date, options: .strictStartDate)

    let findQuery = HKSampleQuery(sampleType: deletedType!, predicate: predicate, limit: HKObjectQueryNoLimit, sortDescriptors: nil) {
        query, results, error in
        if results != nil {
            print("\nHere we got not nil on results!\n")
            for result in (results as? [HKQuantitySample])! {
                let quantity = result.quantity.doubleValue(for: HKUnit.gramUnit(with: .milli))
                print(quantity)
            }
        } else {
            print("results are nil")
            return
        }
    }
    healthKitStore.execute(findQuery)

I didn't do lot in the resultHander block, I firstly want to check what Data I found, and when I pring the quantity, I got noting, but I did get the "Here we got not nil on resluts" which means the results is not nil. I'm fresh to iOS developing and I check the document of HKHealthSample and cannot find which part of my HKSampleQuery wrong!

Original One:

I have an app that writes caffeine data into Health via HealthKit Here is the save function

func saveCaffeine(_ caffeineRecorded: Double, dataDate: Date) {
    // Set the quantity type to the running/walking distance.
    let caffeineType = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.dietaryCaffeine)
    // Set the unit of measurement to miles.
    let caffeineQuantity = HKQuantity(unit: HKUnit.gramUnit(with: .milli), doubleValue: caffeineRecorded)
    // Set the official Quantity Sample.
    let caffeine = HKQuantitySample(type: caffeineType!, quantity: caffeineQuantity, start: dataDate, end: dataDate)
    print("\n to be added: \(caffeine) \n")
    // Save the distance quantity sample to the HealthKit Store.
    healthKitStore.save(caffeine, withCompletion: { (success, error) -> Void in
        if( error != nil ) {
            print(error!)
        } else {
            print("The Caffeine has been recorded! Better go check!")
        }
    })
}

Then It saved succeddfully, after that I retrive the data when I delete from the table view and pass to another delete function :

func deleteCaffeine(_ caffeineRecorded: Double, dataDate: Date){
    let caffeineType = HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.dietaryCaffeine)
    let caffeineQuantity = HKQuantity(unit: HKUnit.gramUnit(with: .milli), doubleValue: caffeineRecorded)
    let coffeeBeenDeleted = HKQuantitySample(type: caffeineType!, quantity: caffeineQuantity, start: dataDate, end: dataDate)
    print("\n to be deleted: \(coffeeBeenDeleted) \n")
    healthKitStore.delete(coffeeBeenDeleted, withCompletion: {(success, error) -> Void in
        if (error != nil) {
            print(error!)
        } else {
            print("This caffeine data just been deleted!")
        }
    })
}

Then I got the error: Error Domain=com.apple.healthkit Code=3 "Failed to find some objects for deletion."

I using Realm to manage the database, I write the data into it that I can then retrieve it.

When I add it the HQuantitySample been printed is: to be added: 30 mg (2017-10-06 18:36:25 -0400 - 2017-10-06 18:36:25 -0400)

When I delete the same one, the HQuantitySample been printed is: to be deleted: 30 mg (2017-10-06 18:36:25 -0400 - 2017-10-06 18:36:25 -0400)

As I understand, it should retrieve the same data since the amount and date is all right. Am I misunderstand anything about delete in HealthKit

Upvotes: 0

Views: 1341

Answers (2)

Jam
Jam

Reputation: 131

You need to define your specific key in HKMetadataKeySyncIdentifier before you save your data to apple health. And then, you can use HKMetadataKeySyncIdentifier to delete specific health data.

You can try my answer: https://stackoverflow.com/a/69624769/8094919

Upvotes: 0

Allan
Allan

Reputation: 7343

You can't delete an HKQuantitySample that was previously saved by constructing a new HKQuantitySample that has similar properties. If there were two caffeine samples in HealthKit with the same start date, end date, and quantity which one would you expect HealthKit to delete? Each HKObject is unique and to delete an object you must first find it using a query and then pass the object you got from the query to delete().

Upvotes: 1

Related Questions