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import UIKit
class ViewController: UIViewController, UIScrollViewDelegate {
//界面设计元素引用
@IBOutlet var pageControl: UIPageControl!
@IBOutlet var scrollView: UIScrollView!
//需要显示的页面内容
var courses = [
["name":"Swift","pic":"swift.png"],
["name":"ObjectC","pic":"oc.jpg"],
["name":"Java","pic":"java.png"]
]
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
//设置scrollView的内容总尺寸
scrollView.contentSize = CGSizeMake(
CGFloat(CGRectGetWidth(self.view.bounds)) * CGFloat(self.courses.count),
CGRectGetHeight(self.view.bounds)
)
//关闭滚动条显示
scrollView.showsHorizontalScrollIndicator = false
scrollView.showsVerticalScrollIndicator = false
scrollView.scrollsToTop = false
//协议代理，在本类中处理滚动事件
scrollView.delegate = self
//滚动时只能停留到某一页
scrollView.pagingEnabled = true
//添加页面到滚动面板里
let size = scrollView.bounds.size
for (seq,course) in enumerate(courses) {
var page = UIView()
var imageView=UIImageView(image:UIImage(named:course["pic"]!))
page.addSubview(imageView);
page.backgroundColor = UIColor.greenColor()
let lbl = UILabel(frame: CGRect(x: 0, y: 20, width: 100, height: 20))
lbl.text = course["name"]
page.addSubview(lbl)
page.frame = CGRect(x: CGFloat(seq) * size.width, y: 0,
width: size.width, height: size.height)
scrollView.addSubview(page)
}
//页控件属性
pageControl.backgroundColor = UIColor.clearColor()
pageControl.numberOfPages = courses.count
pageControl.currentPage = 0
//设置页控件点击事件
pageControl.addTarget(self, action: "pageChanged:", forControlEvents: UIControlEvents.ValueChanged)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//UIScrollViewDelegate方法，每次滚动结束后调用
func scrollViewDidEndDecelerating(scrollView: UIScrollView!) {
//通过scrollView内容的偏移计算当前显示的是第几页
let page = Int(scrollView.contentOffset.x / scrollView.frame.size.width)
//设置pageController的当前页
pageControl.currentPage = page
}
//点击页控件时事件处理
func pageChanged(sender:UIPageControl) {
//根据点击的页数，计算scrollView需要显示的偏移量
var frame = scrollView.frame
frame.origin.x = frame.size.width * CGFloat(sender.currentPage)
frame.origin.y = 0
//展现当前页面内容
scrollView.scrollRectToVisible(frame, animated:true)
}
}
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