如何使用HealthKit快速获取步行和跑步距离 [英] How to get walking and running distance using HealthKit in swift

问题描述

我正在制作Health App.我想从Swift中的HealthKit获取walkingRunningDistance.但是，我有一个问题.返回值为0.0mile.

I'm making Health App. I want to get walkingRunningDistance from HealthKit in Swift. But, I have a problem. Return value is 0.0mile.

为什么返回值是0英里?

Why return value is 0 mile?

我的代码是这个.

func recentSteps3(completion: (Double, NSError?) -> () ){
    let type = HKSampleType.quantityTypeForIdentifier(HKQuantityTypeIdentifierDistanceWalkingRunning)

    let date = NSDate()

    let cal = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!

    let newDate = cal.startOfDayForDate(date)

    let predicate = HKQuery.predicateForSamplesWithStartDate(newDate, endDate: NSDate(), options: HKQueryOptions.StrictStartDate)

    let query = HKSampleQuery(sampleType: type!, predicate: predicate, limit: HKObjectQueryNoLimit, sortDescriptors: nil) { query, results, error in

        var distance: Double = 0

        if results?.count > 0
        {
            for result in results as! [HKQuantitySample]
            {
                distance += result.quantity.doubleValueForUnit(HKUnit.mileUnit())
            }
        }

        completion(distance, error)
    }

    healthAuth.healthStore.executeQuery(query)
}

推荐答案

您的代码将在以下情况下返回值

Your code will return a value if

1. 您已请求用户允许阅读 从HealthKit运行distanceWalkingRunning
2. 用户已授予您的应用权限.

1. You have requested permission from the user to read distanceWalkingRunning from HealthKit
2. The user has granted your app permission.

否则，您的代码将返回0.

If not, your code will return 0.

要请求授权，您可以致电

To request authorization, you can call

func requestAuthorization(toShare typesToShare: Set<HKSampleType>?, read typesToRead: Set<HKObjectType>?, completion: @escaping (Bool, Error?) -> Swift.Void)

其中typesToRead包含

let distanceType =  HKSampleType.quantityType(forIdentifier: HKQuantityTypeIdentifier.distanceWalkingRunning)!

我相信使用HKStatisticsQuery或HKStatisticsCollectionQuery会更高效.这是一个例子.

I believe that using a HKStatisticsQuery or HKStatisticsCollectionQuery will be more efficient. Here is an example.

guard let type = HKSampleType.quantityType(forIdentifier: .distanceWalkingRunning) else {
    fatalError("Something went wrong retriebing quantity type distanceWalkingRunning")
}
let date =  Date()
let cal = Calendar(identifier: Calendar.Identifier.gregorian)
let newDate = cal.startOfDay(for: date)

let predicate = HKQuery.predicateForSamples(withStart: newDate, end: Date(), options: .strictStartDate)

let query = HKStatisticsQuery(quantityType: type, quantitySamplePredicate: predicate, options: [.cumulativeSum]) { (query, statistics, error) in        
    var value: Double = 0

    if error != nil {
        print("something went wrong")
    } else if let quantity = statistics?.sumQuantity() {
        value = quantity.doubleValue(for: HKUnit.mile())
    }
    DispatchQueue.main.async {
        completion(value)
    }
}
healthStore.execute(query)

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