swift - 如何将stepCount输出到文本字符串(UILabel)

抱歉，我的格式，缺乏理解，术语等。我只学了两天，所以我仍然不太明白。
我是一个平面设计师的贸易，我正在努力使一个个人使用的应用程序，呼吁一些数据，并使它看起来更吸引我的视觉。我想为一天创建一个步骤计数，并从运行状况应用程序中提取此信息。
首先，我已经到了可以调用HealthKit StepCount来显示那天所采取的步骤的程度。只要我使用一个按钮（IBAction）来获取stepCount数据，然后输出到文本字符串（UILabel），这就成功了。（例如，输出小数点为66.0的数字，但一次只能执行一步，哈！）
现在，我只想自动填充“totalSteps UILabel”来显示步数，而不必按按钮来操作它。
我尝试了很多不同的方法，但都忘了我尝试了什么，把尝试过的代码放在了哪里，所以任何帮助和/或简短的解释都会很好！
谢谢您

import UIKit
import HealthKit

class ViewController: UIViewController {

    @IBOutlet weak var totalSteps: UILabel!
    @IBOutlet weak var quotePhrase: UITextView!

    let healthStore = HKHealthStore()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.


        func authoriseHealthKitAccess(_ sender: Any) {
            let healthKitTypes: Set = [
                // access step count
                HKObjectType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!
            ]
            healthStore.requestAuthorization(toShare: healthKitTypes, read: healthKitTypes) { (_, _) in
                print("authrised???")
            }
            healthStore.requestAuthorization(toShare: healthKitTypes, read: healthKitTypes) { (bool, error) in
                if let e = error {
                    print("oops something went wrong during authorisation \(e.localizedDescription)")
                } else {
                    print("User has completed the authorization flow")
                }
            }
        }
    }

    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 {
                print("Failed to fetch steps rate")
                completion(resultCount)
                return
            }
            if let sum = result.sumQuantity() {
                resultCount = sum.doubleValue(for: HKUnit.count())
            }

            DispatchQueue.main.async {
                completion(resultCount)
            }
        }
        healthStore.execute(query)
    }

    //Button Action Here:

    @IBAction func getTotalSteps(_ sender: Any) {
        getTodaysSteps { (result) in
            print("\(result)")
            DispatchQueue.main.async {
                self.totalSteps.text = "\(result)"
            }
        }
    }
}

最佳答案

您只需要在viewDidLoad中调用相同的代码。当用户授予访问运行状况数据的权限时，还应该调用该代码。我在下面的代码中介绍了这两种情况。

import UIKit
import HealthKit

class ViewController: UIViewController {

    @IBOutlet weak var totalSteps: UILabel!
    @IBOutlet weak var quotePhrase: UITextView!

    let healthStore = HKHealthStore()

    override func viewDidLoad() {
        super.viewDidLoad()
        self.authoriseHealthKitAccess()
    }

    func authoriseHealthKitAccess() {
            let healthKitTypes: Set = [
                // access step count
                HKObjectType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!
            ]
            healthStore.requestAuthorization(toShare: healthKitTypes, read: healthKitTypes) { [weak self] (bool, error) in
                if let e = error {
                    print("oops something went wrong during authorisation \(e.localizedDescription)")
                } else {
                    print("User has completed the authorization flow")
                    self?.updateStepsCountLabel()
                }
           }
     }

    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 {
                print("Failed to fetch steps rate")
                completion(resultCount)
                return
            }
            if let sum = result.sumQuantity() {
                resultCount = sum.doubleValue(for: HKUnit.count())
            }

            DispatchQueue.main.async {
                completion(resultCount)
            }
        }
        healthStore.execute(query)
    }

    private func updateStepsCountLabel() {
        getTodaysSteps { (result) in
            print("\(result)")
            DispatchQueue.main.async {
                self.totalSteps.text = "\(result)"
            }
        }
    }

    //Button Action Here:

    @IBAction func getTotalSteps(_ sender: Any) {
        updateStepsCountLabel()
    }
}