Swift UIImageView和UISlider组合

 /***************火焰图片Demo************start*******/

    var imgView: UIImageView?

    

    override func viewDidLoad() {

        super.viewDidLoad()

        

        let screenWidth = UIScreen.mainScreen().bounds.size.width

        imgView = UIImageView(frame: CGRect(x: 20, y: 100, screenWidth - 20 * 2, height: screenWidth - 20 * 2))

        imgView!.backgroundColor = UIColor.redColor()

        self.view.addSubview(imgView!)

        

        // 初始化数组

        var imgs:[UIImage] = []

        

        for index in 1...17 {

            let imgName = NSString(format: "campfire%02d.gif", index)

            if let img:UIImage = UIImage(named: imgName as String) {

                

                // 按图片添加到数组中  append功能是直接添加到数组的lastobject

                imgs.append(img)

            }

        }

        

        imgView?.animationImages = imgs

        imgView?.animationDuration = 1

        imgView?.startAnimating()

        

        let slider = UISlider(frame: CGRect(x: 20, y: 100 + imgView!.frame.size.height + 50, imgView!.frame.size.width, height: 30))

        slider.value = 0.5

        slider.addTarget(self, action: "sliderAction:", forControlEvents: UIControlEvents.ValueChanged)

        self.view.addSubview(slider)

        

    }

    

    // MARK: slider 的拖动tart的方法

    func sliderAction(slider: UISlider) {

        imgView?.animationDuration = NSTimeInterval(slider.value * 2)

        imgView?.startAnimating()

    }

    

/***************火焰图片Demo************start*******/