//返回按钮事件
     @IBAction func backButtonClick()
     {
         self.navigationController?.popViewControllerAnimated(true)
     }

     @IBOutlet var xLabel:UILabel!
     @IBOutlet var yLabel:UILabel!
     @IBOutlet var zLabel:UILabel!

     @IBOutlet var orientationLabel:UILabel!

     //加速计管理者-所有的操作都会由这个motionManager接管
     var motionManager:CMMotionManager!

     override func viewDidLoad() {
         super.viewDidLoad()

         titleLabel.text = titleString

         //------ CoreMotion 加速计
         motionManager = CMMotionManager()//注意CMMotionManager不是单例
         motionManager.accelerometerUpdateInterval = 0.1//设置读取时间间隔

         if motionManager.accelerometerAvailable//判断是否可以使用加速度计
         {
             //获取主线程并发队列,在主线程里跟新UI
             motionManager.startAccelerometerUpdatesToQueue(NSOperationQueue.mainQueue(), withHandler: { (var accelerometerData:CMAccelerometerData?, var error:NSError?) -> Void in

                 if error != nil
                 {
                     self.motionManager.stopAccelerometerUpdates()//停止使用加速度计
                 }else
                 {

                     self.xLabel.text = "x:\(accelerometerData!.acceleration.x)"
                     self.yLabel.text = "Y:\(accelerometerData!.acceleration.y)"
                     self.zLabel.text = "Z:\(accelerometerData!.acceleration.z)"
                 }
             })

         }else
         {
             let aler = UIAlertView(title: "您的设备不支持加速计", message: nil, delegate: nil, cancelButtonTitle: "OK")
             aler.show()
         }

         //感知设备方向-开启监听设备方向
         UIDevice.currentDevice().beginGeneratingDeviceOrientationNotifications()

         //添加通知，监听设备方向改变
         NSNotificationCenter.defaultCenter().addObserver(self, selector: "receivedRotation", name: UIDeviceOrientationDidChangeNotification, object: nil)

         //关闭监听设备方向
         UIDevice.currentDevice().endGeneratingDeviceOrientationNotifications()
     }

     override func didReceiveMemoryWarning() {
         super.didReceiveMemoryWarning()
         // Dispose of any resources that can be recreated.
     }

     // MARK: - 判断设备方向代理方法
     func receivedRotation()
     {
         var device = UIDevice.currentDevice()

         if device.orientation == UIDeviceOrientation.Unknown
         {
             orientationLabel.text = "Unknown"
         }
         else if device.orientation == UIDeviceOrientation.Portrait
         {
             orientationLabel.text = "Portrait"
         }
         else if device.orientation == UIDeviceOrientation.PortraitUpsideDown
         {
              orientationLabel.text = "PortraitUpsideDown"
         }
         else if device.orientation == UIDeviceOrientation.LandscapeLeft
         {
              orientationLabel.text = "LandscapeLeft"
         }
         else if device.orientation == UIDeviceOrientation.LandscapeRight
         {
              orientationLabel.text = "LandscapeRight"
         }else if device.orientation == UIDeviceOrientation.FaceUp
         {
              orientationLabel.text = "FaceUp"
         }
         else  if device.orientation == UIDeviceOrientation.FaceDown
         {
              orientationLabel.text = "FaceDown"
         }
     }

     // MARK: - 摇晃事件
     override func motionBegan(motion: UIEventSubtype, withEvent event: UIEvent) {

         println("motionBegan")//开始摇晃
     }

     override func motionEnded(motion: UIEventSubtype, withEvent event: UIEvent) {
         println("motionEnded")//摇晃结束
     }

     override func motionCancelled(motion: UIEventSubtype, withEvent event: UIEvent) {
         println("motionCancelled")//摇晃被意外终止
     }