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Noob IOS Dev はエラーを特定できません。スレッド 1 を助けてください: EXC_BREAKPOINT (code=1,subcode=0x1003591fc)

var pedometer :CMPedometer!
var stepCount :Int = 0
@IBOutlet var labelSteps: UILabel!
@IBAction func btnStart(_ sender: Any) {
    *Pedometer*
    if CMPedometer.isStepCountingAvailable() {
        self.pedometer.startUpdates(from: NSDate() as Date, withHandler: {
            data, error in
            if data != nil {
                // Add to existing counts
                self.stepCount += (data?.numberOfSteps as! Int)
                self.labelSteps.text = "\(self.stepCount)"

            }
        })
    }
}

@IBAction func btnStop(_ sender: Any) {
    //self.labelSteps.text = "0"
    //self.pedometer.stopUpdates()
    print("Stop")
}

ありがとう。すぐに応答を期待しています。

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