Swift

UIScrollView提供了以页面为单位滚动显示各个子页面内容的功能，每次手指滑动后会滚动一屏的内容。

要实现该功能，需要如下操作：

1，将UIScrollView的pagingEnabled属性设置成true

2，必须通过contentSize属性设置各个页面相加的宽度。比如iphone手机一屏宽度是320，如果有3个页面，则contentSize就需要设置为320*3=960

3，最好将showsHorizontalScrollIndicator和showsVerticalScrollIndicator设置成false隐藏横向和纵向滚动条。

4，如果scrollsToTop不需要也设置成false。

--- 主页面 ---

class ViewController: UIViewController{
    let numOfPages = 3
    let pageWidth = 320
    let pageHeight = 360
     
    override func viewDidLoad(){
        super.viewDidLoad()
         
        //scrollView的初始化
        var scrollView = UIScrollView()
        scrollView.frame = self.view.bounds
        //为了让内容横向滚动，设置横向内容宽度为3个页面的宽度总和
        scrollView.contenSize=CGSizeMake(CGFloat(pageWidth*numOfPages), CGFloat(pageHeight))
        scrollView.pagingEnabled = true
        scrollView.showsHorizontalScrollIndicator = false
        scrollView.showsVerticalScrollIndicator = false
        scrollView.scrollsToTop = false
         
        //添加子页面
        for i in 0..numOfPages{
            var myViewController = MyViewController(number:(i+1))
            myViewController.view.frame = CGRectMake(CGFloat(pageWidth*i),
            CGFloat(0), CGFloat(pageWidth), CGFloat(pageHeight))
            scrollView.addSubview(myViewController.view)
        }
        self.view.addSubview(scrollView)
    }
}

--- 子页面 ---

class MyViewController: UIViewController{
    var number:Int!
    let colorMap=[
        1:UIColor.blackColor(),
        2:UIColor.orangeColor(),
        3:UIColor.blueColor()
    ]
     
    init(number initNumber:Int){
        self.number = initNumer
        super.init(nibNmae:nil, bundle:nil)
    }
     
    override func viewDidLoad(){
        var numberLabel = UILabel(frame:CGRectMake(0,0,100,100))
        numberLabel.center = self.view.center
        numberLabel.text = "第(number)页"
        numberLabel.textColor = UIColor.whiteColor()
        self.view.addSubview(numberLabel)
        self.view.backgroundColor = colorMap[number]
    }
}