灵活的轮播容器RinedPages

项目介绍：

有两个主要的自定义视图: PagesCarousel 和 ImagePageControl, 可以完全独立地使用这两个视图.

RinedPages 是对以上两个视图的包装.

Objective-C版本:RPRingedPages
Swift版本: RingedPages

用法

假设在一个UIViewController里

    lazy var pages: RingedPages = {
        let screenWidth = UIScreen.main.bounds.size.width
        let pagesFrame = CGRect(x: 0, y: 100, width: screenWidth, height: screenWidth * 0.4)
        let pages = RingedPages(frame: pagesFrame)
        let height = pagesFrame.size.height - pages.pageControlMarginBottom - pages.pageControlMarginTop - pages.pageControlHeight
        pages.carousel.mainPageSize = CGSize(width: height * 0.8, height: height)
        pages.carousel.pageScale = 0.6
        pages.dataSource = self
        pages.delegate = self
        return pages
    }()
    
    lazy var dataSource: [String] = {
        var array = [String]()
        let s = "ABCDEFG"
        for i in 0..<s.characters.count {
            array.append(String(s[i]))
        }
        return array
    }()
        

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(pages)
        pages.reloadData()
    }

    func numberOfItems(in ringedPages: RingedPages) -> Int {
        return dataSource.count
    }
    func ringedPages(_ pages: RingedPages, viewForItemAt index: Int) -> UIView {
        var label: UILabel?
        if let view = pages.dequeueReusablePage() {
            if view is UILabel {
                label = view as? UILabel
            }
        }
        if label == nil {
            label = UILabel()
            label?.font = UIFont.systemFont(ofSize: 50)
            label?.textAlignment = .center
            label?.textColor = UIColor.white
            label?.layer.backgroundColor = UIColor.black.cgColor
            label?.layer.cornerRadius = 5
        }
        label?.text = dataSource[index]
        return label!
    }
    func didSelectCurrentPage(in pages: RingedPages) {
        print("pages selected, the current index is \(pages.currentIndex)")
    }
    func ringedPages(_ pages: RingedPages, didScrollTo index: Int) {
        print("Did scrolled to index: \(index)")
    }