swift - 当之前在设备上授权 healthkit 访问时工作正常，但否则会崩溃

Question

override func viewDidLoad() {
    super.viewDidLoad()
    ref = Database.database().reference()
    let healthKitTypes: Set = [
        // access step count
        HKObjectType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount)!
    ]
    healthStore.requestAuthorization(toShare: healthKitTypes, read: healthKitTypes) { (_, _) in
        print("authorized???")
    }
    healthStore.requestAuthorization(toShare: healthKitTypes, read: healthKitTypes) { (bool, error) in
        if let e = error {
            print("oops something went wrong during authorization \(e.localizedDescription)")
        } else {
            print("User has completed the authorization flow")
        }
    }


    getTodaysSteps { (result) in
        print("\(result)")
        self.steps = result

        DispatchQueue.main.async {
            if result == 0 {
                self.StepDisplay.text = " You haven't walked"
            } else {
                self.StepDisplay.text = "\(result)"
            }

        }
    }


    getStepHistory()



}


func getStepHistory() {
    let calendar = Calendar.current
    var interval = DateComponents()
    interval.day = 1

    // Set the anchor date to Monday at 3:00 a.m.
    var anchorComponents = calendar.dateComponents([.day, .month, .year, .weekday], from: Date())


    let offset = (7 + (anchorComponents.weekday ?? 0) - 2) % 7
    anchorComponents.day = (anchorComponents.day ?? 0) - offset
    anchorComponents.hour = 0
    anchorComponents.minute = 1

    guard let anchorDate = calendar.date(from:anchorComponents) else {
        fatalError("*** unable to create a valid date from the given components ***")
    }

    guard let quantityType = HKObjectType.quantityType(forIdentifier: HKQuantityTypeIdentifier.stepCount) else {
        fatalError("*** Unable to create a step count type ***")
    }

当授权已在设备上给出时，此代码可以正常工作。但是，如果之前未授权，除非在 viewDidLoad 中将 getStepHistory() 注释掉，否则它将无法工作。我尝试从 getStepHistory() 函数中请求额外的授权，但它没有解决问题

Answer 1

如果已经授权，需要在完成 block 中调用getStepHistory来requestAuthorization。

healthStore.requestAuthorization(toShare: healthKitTypes, read: healthKitTypes) { (success, error) in
    if let e = error {
        print("oops something went wrong during authorization \(e.localizedDescription)")
    } else if success {
        print("User has granted access")
        getStepHistory()
    } else {
        print("User has completed the authorization flow but there is no access")
    }
}