swift计步器CMPedometer的使用方法

//  计步器
  var myTextView = UITextView()
  var pedometer = CMPedometer()
  var myBtn = UIButton()

  myBtn.frame = CGRect(x:10,y:360,width:kScreenWidth-20,height:50)
  myBtn.setTitle("按钮", for: .normal)
  myBtn.setTitle("倒计时中", for: .disabled)
  myBtn.backgroundColor = UIColor.orange
  myBtn.setTitleColor(UIColor.white, for: .normal)
  myBtn.setTitleColor(UIColor.blue, for: .disabled)
  myBtn.addTarget(self, action: #selector(btnClick), for: .touchUpInside)
  self.view.addSubview(myBtn）

func btnClick(){
  self.startPedometerUpdates()
    
  }

//  ---------------------------------计步器--------------------------------------------
func creatPedometer(){
  myTextView.frame = CGRect(x:20,y:100,width:kScreenWidth-20,height:200)
  self.view.addSubview(myTextView)
  
//    创建触发按钮
  myBtn.frame = CGRect(x:10,y:360,width:kScreenWidth-20,height:50)
  myBtn.setTitle("按钮", for: .normal)
//    myBtn.setTitle("倒计时中", for: .disabled)
  myBtn.backgroundColor = UIColor.orange
//    myBtn.setTitleColor(UIColor.white, for: .normal)
//    myBtn.setTitleColor(UIColor.blue, for: .disabled)
  myBtn.addTarget(self, action: #selector(btnClick), for: .touchUpInside)
  self.view.addSubview(myBtn)
}

//  开始获取步数统计数据
func startPedometerUpdates(){
  
//   判断设备支持情况
  guard CMPedometer.isStepCountingAvailable() else {
    self.myTextView.text = "\n当前设备不支持获取步数\n"
    return
  }
  
//    获取今天凌晨时间
  let cal = Calendar.current
  var comps = cal.dateComponents([.year,.month,.day], from: Date())
  comps.hour = 0
  comps.minute = 0
  comps.second = 0
  let midnightOfToday = cal.date(from: comps)
  
//初始化并开始实时获取数据
    self.pedometer.startUpdates (from: midnightOfToday!, withHandler: { pedometerData, error in
      //错误处理
      guard error == nil else {
        print(error!)
        return
      }
    
      //获取各个数据
      var text = "---今日运动数据---\n"
      if let numberOfSteps = pedometerData?.numberOfSteps {
        text += "步数: \(numberOfSteps)\n"
      }
      if let distance = pedometerData?.distance {
        text += "距离: \(distance)\n"
      }
      if let floorsAscended = pedometerData?.floorsAscended {
        text += "上楼: \(floorsAscended)\n"
      }
      if let floorsDescended = pedometerData?.floorsDescended {
        text += "下楼: \(floorsDescended)\n"
      }
      if #available(iOS 9.0, *) {
        if let currentPace = pedometerData?.currentPace {
          text += "速度: \(currentPace)m/s\n"
        }
      } else {
        // Fallback on earlier versions
      }
      if #available(iOS 9.0, *) {
        if let currentCadence = pedometerData?.currentCadence {
          text += "速度: \(currentCadence)步/秒\n"
        }
      } else {
        // Fallback on earlier versions
      }
      
//        在线程中更新文本框数据
      DispatchQueue.main.async {
        
        self.myTextView.text = text
      }
      
  })