Swift小练习-引导页

任何一门语言,只要长期不用就会忘掉,得时不时的敲敲小项目,练练手;

let scrollViewBG = UIScrollView.init(frame: SLScreenRect)

let images = ["first","second","third"]

let pageControl = UIPageControl.init(frame: CGRect.init(x: 0, y: SLScreenHeight - 30, width: SLScreenWidth, height: 20))

var currentPage = 0

override var prefersStatusBarHidden: Bool {

return true

}

override func viewDidLoad() {

super.viewDidLoad()

// Do any additional setup after loading the view, typically from a nib.

configureView()

}

　　func configureView() {

// 遍历数组,同时获得index

for (index, value) in images.enumerated() {

let imageView = UIImageView.init(frame: CGRect.init(x: CGFloat(index)*SLScreenWidth, y: 0, width: SLScreenWidth, height: SLScreenHeight))

imageView.image = UIImage.init(named: value)

// 限制边界

imageView.clipsToBounds = true

imageView.contentMode = .scaleAspectFill

scrollViewBG .addSubview(imageView)

}

// 协议

scrollViewBG.delegate = self

scrollViewBG.isPagingEnabled = true

scrollViewBG.showsHorizontalScrollIndicator = false

scrollViewBG.contentSize = CGSize.init(width: SLScreenWidth*CGFloat(images.count), height: SLScreenHeight)

// pagecontol

pageControl.numberOfPages = images.count

pageControl.currentPageIndicatorTintColor = .white

pageControl.pageIndicatorTintColor = .lightGray

pageControl.currentPage = currentPage

pageControl.isEnabled = false

view.addSubview(scrollViewBG)

view.addSubview(pageControl)

}

　　//MARK: - 协议方法

func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {

currentPage = Int(scrollView.contentOffset.x/SLScreenWidth)

pageControl.currentPage = currentPage

}