SWIFT用ScrollView加图片制作Banner

网上参考OBJC写的用ScrollView图片轮播效果，照着画了个，先上效果图:

附上代码：

 1 @IBOutlet weak var pc: UIPageControl!
 2     @IBOutlet weak var sv:UIScrollView!
 3     
 4     var timer:NSTimer!
 5     
 6     override func viewDidLoad() {
 7         super.viewDidLoad()
 8         
 9         for i in 1...6{ //loading the images
10             let image = UIImage(named: "pic\(i).jpg")!
11             let x = CGFloat(i - 1) * self.view.frame.width //这一步获取ScrollView的宽度时我用IPHONE6实体机测试是320，右边会出现第二张图片的一部分，最后还是用ROOT VIEW的宽度
12             var imageView = UIImageView(frame: CGRectMake(x, 0, self.view.frame.width, sv.bounds.height))
13             imageView.image = image
14             sv.pagingEnabled = true
15             sv.showsHorizontalScrollIndicator = false
16             sv.scrollEnabled = true
17             sv.addSubview(imageView)
18             sv.delegate = self
19         }
20         
21         sv.contentSize = CGSizeMake((self.view.frame.width * 6), sv.frame.height)
22         pc.numberOfPages = 6
23         pc.currentPageIndicatorTintColor = UIColor.redColor()
24         pc.pageIndicatorTintColor = UIColor.whiteColor()
25         addTimer()
26         
27     }
28     
29     func scrollViewDidScroll(scrollView: UIScrollView) {
30         let width = self.view.frame.width
31         let offsetX = scrollView.contentOffset.x
32         let index = (offsetX + width / 2) / width
33         pc.currentPage = Int(index)
34     }
35     
36     func scrollViewWillBeginDragging(scrollView: UIScrollView) {
37         removeTimer()
38     }
39     
40     func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {
41         addTimer()
42     }
43     
44     func addTimer() {
45         timer = NSTimer.scheduledTimerWithTimeInterval(5, target: self, selector: "nextImage", userInfo: nil, repeats: true)
46     }
47     
48     func removeTimer() {
49         timer.invalidate()
50     }
51 
52     
53     func nextImage() {
54         var pageIndex = pc.currentPage
55         if pageIndex == 5 {
56             pageIndex = 0
57         } else {
58             pageIndex++
59         }
60         
61         var offsetX = CGFloat(pageIndex) * self.view.frame.width
62         sv.setContentOffset(CGPointMake(offsetX, 0), animated: true)
63     }