加速传感器(CoreMotion) swift

//
// ViewController.swift
// UILabelTest
//
// Created by mac on 15/6/23.
// Copyright (c) 2015年 fangyuhao. All rights reserved.
//

import UIKit
import CoreMotion

class ViewController: UIViewController,UIAccelerometerDelegate {

var ball:UIImageView!
var speedX:UIAccelerationValue = 0
var speedY:UIAccelerationValue = 0
var motionManager = CMMotionManager()

override func viewDidLoad() {
    super.viewDidLoad()

    ball = UIImageView(image: UIImage(named:"ball"))
    ball.frame = CGRectMake(0, 0, 50, 50)
    ball.center = self.view.center
    self.view.addSubview(ball)
    motionManager.accelerometerUpdateInterval = 1/60

    if(motionManager.accelerometerAvailable){
        var queue = NSOperationQueue.currentQueue()
        motionManager.startAccelerometerUpdatesToQueue(queue, withHandler: {(accelerometerData:CMAccelerometerData!,error:NSError!)in
            //动态设置小球位置
            self.speedX += accelerometerData.acceleration.x
            self.speedY += accelerometerData.acceleration.y
            var posX = self.ball.center.x + CGFloat(self.speedX)
            var posY = self.ball.center.y - CGFloat(self.speedY)
            //碰到边框后的反弹处理
            if posX<0{
                posX = 0
                //碰到左边的边框后以0.4倍的速度反弹
                self.speedX *= -0.4
            }else if posX > self.view.bounds.size.width{
                posX = self.view.bounds.size.width
                //碰到右边的边框后以0.4倍的速度反弹
                self.speedX *= -0.4
            }
            if posY<0{
                posY = 0
                //碰到上面的边框不反弹
                self.speedY = 0
            }else if posY>self.view.bounds.size.height{
                posY = self.view.bounds.size.height
                //碰到下面的边框以1.5倍的速度反弹
                self.speedY *= -1.5
            }
            self.ball.center = CGPointMake(posX, posY)


        })
    }

    // Do any additional setup after loading the view, typically from a nib.
}

}