使用CMPedometer函数时iOS应用程序崩溃

import CoreMotion

class PedometerManager {
    private let pedometer = CMPedometer()

    func startTracking() {
        guard CMPedometer.isStepCountingAvailable() else {
            print("Pedometer is not available on this device.")
            return
        }

        let calendar = NSCalendar.current
        let now = Date()
        let startDate = calendar.startOfDay(for: now)
        let endDate = calendar.date(byAdding: .day, value: 1, to: startDate)!

        pedometer.queryPedometerData(from: startDate, to: endDate) { (data, error) in
            if let error = error {
                print("Error occurred: \(error.localizedDescription)")
            } else if let data = data {
                print("Steps from \(startDate) to \(endDate): \(data.numberOfSteps)")
            }
        }

        pedometer.startUpdates(from: startDate) { (data, error) in
            if let error = error {
                print("Error occurred: \(error.localizedDescription)")
            } else if let data = data {
                print("Current steps: \(data.numberOfSteps ?? 0)")
            }
        }
    }

    func stopTracking() {
        pedometer.stopUpdates()
    }
}