class ViewController: UIViewController, UIScrollViewDelegate {

    @IBOutlet weak var scroll: UIScrollView!
    var topView = UIView()
    var imageView: UIImageView?
    let image = UIImage(named: "4")

    var aView: UIView?
    var label: UILabel?

    override func viewDidLoad() {
        super.viewDidLoad()

        scroll.frame = self.view.frame

        topView.backgroundColor = UIColor.greenColor()

        imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: 200))
        imageView?.image = image

        imageView?.contentMode = UIViewContentMode.ScaleAspectFill

        topView.addSubview(imageView!)



        label = UILabel(frame: CGRectMake(10, 50, view.frame.width-20, 50))
        label?.numberOfLines = 0
        label?.text = "课程描述：UIKit框架是iPhone应用程序开发中最基本的框架，也是用得最多、最重要的框架，从名字我们就能理解是界面相关操作组件集合。本套课程系统全面的学习iOS界面组件UIKit，不但熟悉各个界面组件操作，更重要的是深入浅出的理解原理，实在是市面不可多得的iOS界面教学课程。"
        label?.font = UIFont.systemFontOfSize(16)

        scroll.addSubview(topView)


        var labelHeight = label?.frame.height
        var topHeight = imageView?.frame.height
        println("\(labelHeight), \(topHeight)")

        scroll.contentSize = CGSize(width: self.view.frame.width, height: labelHeight!+topHeight!)
        scroll.addSubview(label!)
    }

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


    func scrollViewDidScroll(scrollView: UIScrollView) {

    }
}