Ios 从CMPedometer检索数据时出现问题：“；回复消息时出错（连接无效）"；

我试图使用CoreMotion的CMPedometer获取步数，但我在日志中得到了以下错误，而不是步数：消息回复错误（连接无效）。下面的示例在设备上运行（不是模拟器）

代码（ViewController.swift中的viewDidLoad内部）：

日志：

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似乎

let pedometer=CMPedometer（）

必须是非本地的，例如在viewDidLoad的

之外的类中声明。几乎所有代码：

@IBOutlet weak var stepLabel: UILabel!
let pedometer = CMPedometer()
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.

    if CMPedometer.isStepCountingAvailable() {
        print("Step counting is available...")
        let calendar = Calendar.current
        var toDate = Date()
        var fromDate = calendar.startOfDay(for: toDate)
        fromDate = calendar.date(byAdding: .hour, value: -24, to: fromDate)!
        toDate = calendar.date(byAdding: .hour, value: 2, to: toDate)!
        print("From date = \(fromDate)")
        print("To date = \(toDate)")

        pedometer.queryPedometerData(from: fromDate, to: toDate) { (data, error) in
            print("Handler (data):")
            print(data!)
            guard let activityData = data, error == nil else {
                print("There was an error getting the data: \(error!)")
                return
            }
            DispatchQueue.main.async {
                self.stepLabel.text = "Steps and distance: \(activityData.numberOfSteps) \(activityData.distance ?? -1)"
            }
        }
    }
}

Step counting is available...
From date = 2019-06-15 22:00:00 +0000
To date = 2019-06-15 22:48:35 +0000
2019-06-16 00:48:40.827268+0200 StepTest2[3857:1087379] [Generic_deprecated] Error on message reply (Connection invalid)

@IBOutlet weak var stepLabel: UILabel!
let pedometer = CMPedometer()
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.

    if CMPedometer.isStepCountingAvailable() {
        print("Step counting is available...")
        let calendar = Calendar.current
        var toDate = Date()
        var fromDate = calendar.startOfDay(for: toDate)
        fromDate = calendar.date(byAdding: .hour, value: -24, to: fromDate)!
        toDate = calendar.date(byAdding: .hour, value: 2, to: toDate)!
        print("From date = \(fromDate)")
        print("To date = \(toDate)")

        pedometer.queryPedometerData(from: fromDate, to: toDate) { (data, error) in
            print("Handler (data):")
            print(data!)
            guard let activityData = data, error == nil else {
                print("There was an error getting the data: \(error!)")
                return
            }
            DispatchQueue.main.async {
                self.stepLabel.text = "Steps and distance: \(activityData.numberOfSteps) \(activityData.distance ?? -1)"
            }
        }
    }
}