无法获得今天的步骤来显示标签

Question

我想创建一个标签，显示今日从HealthKit的步骤。我已尽可能允许HealthKit读取/写入数据，但我坚持实际获取数据。

任何人都可以提供任何建议吗？这里是我的代码，包括我想要显示的步骤标签：

import Foundation 
import UIKit 
import HealthKit 


class HealthKitPage : UIViewController 
{ 
     let healthStore: HKHealthStore = HKHealthStore() 

     override func viewDidLoad() 
     { 
       var shareTypes = Set<HKSampleType>() 

       shareTypes.insert(HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!) 

       var readTypes = Set<HKObjectType>() 
       readTypes.insert(HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!) 


       healthStore.requestAuthorization(toShare: shareTypes, read: readTypes) { (success, error) -> Void in 
          if success { 
            print("success") 
          } else { 
            print("failure") 
          } 

          if let error = error { print(error) } 


       } 


     } 

     @IBOutlet weak var StepCount: UILabel! 



} 

Answer 1

可以使用HKStatisticsQuery获取今天的步骤。你现在可以在你的视图控制器中使用getTodaysSteps方法并设置你的标签的文本属性。

雨燕3.1：

let healthStore = HKHealthStore() 

    func getTodaysSteps(completion: @escaping (Double) -> Void) { 
     let stepsQuantityType = HKQuantityType.quantityType(forIdentifier: .stepCount)! 

     let now = Date() 
     let startOfDay = Calendar.current.startOfDay(for: now) 
     let predicate = HKQuery.predicateForSamples(withStart: startOfDay, end: now, options: .strictStartDate) 

     let query = HKStatisticsQuery(quantityType: stepsQuantityType, quantitySamplePredicate: predicate, options: .cumulativeSum) { (_, result, error) in 
      var resultCount = 0.0 

      guard let result = result else { 
       log.error("Failed to fetch steps = \(error?.localizedDescription ?? "N/A")") 
       completion(resultCount) 
       return 
      } 

      if let sum = result.sumQuantity() { 
       resultCount = sum.doubleValue(for: HKUnit.count()) 
      } 

      DispatchQueue.main.async { 
       completion(resultCount) 
      } 
     } 

     healthStore.execute(query) 
    } 

您可以调用此方法是这样的：

override func viewDidLoad() { 
    super.viewDidLoad() 

    getTodaysStepCount { [weak self] steps in 
     self?.StepCount.text = "\(steps)" 
    } 
}