ICycleView 1.0.2

ICycleView 1.0.2

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Maintained by [XiaLuo].

ICycleView 1.0.2

ICycleView

ICycleView是一个基于UICollectionView实现的轻量级无限轮播图


Content

Features

  • 支持单张图片
  • 支持滚动图片宽度设置
  • 支持本地图片显示，网路图显示，本地图片和网路图混合显示
  • 支持自定义图片展示Cell（纯代码和Xib创建都支持）
  • 支持UIPageControl具体位置设置
  • 支持UIPageControl显示颜色设置
  • 支持图片点击回调
  • 支持图片滚动回调

Requirements

  • iOS 8.0+

  • Swift 4.0+

CocoaPods

pod 'ICycleView', '~> 1.0.0'

在终端 pod search 'ICycleView' 时若出现 Unable to find a pod with name, author, summary, or description matching 'ICycleView' 错误
请在终端运行

  1. pod setup
  2. $rm ~/Library/Caches/CocoaPods/search_index.json

Usage

默认滚动视图

// 惰性初始化滚动视图
lazy var defaultCycleView: ICycleView = {
    let cycleView = ICycleView(frame: CGRect(x: 0, y: 50, width: UIScreen.main.bounds.width, height: 130*scaleForPlus))
    view.addSubview(cycleView)
    return cycleView
}()

// 图片赋值
defaultCycleView.pictures = pictures

自定义图片宽度和指示器的位置和颜色

// 惰性初始化滚动视图
lazy var customPagetrolPositionnCycleView: ICycleView = {
    let cycleView = ICycleView(frame: CGRect(x: 0, y: 190, width: UIScreen.main.bounds.width, height: 130*scaleForPlus))
    cycleView.imgViewWidth = 374*scaleForPlus
    cycleView.pageIndicatorTintColor = .green
    view.addSubview(cycleView)
    return cycleView
}()

// 图片赋值
customPagetrolPositionnCycleView.pictures = pictures
// pageControlStyle属性必须在设置 pictures 后赋值，因为指示器是根据 numberOfPages 计算Size的
customPagetrolPositionnCycleView.pageControlStyle = .bottom(bottom: -20)
customPagetrolPositionnCycleView.pageControlStyle = .right(trailing: 30*scaleForPlus)

自定义Cell-纯代码和Xib创建都支持

// 惰性初始化滚动视图
lazy var customPictureCellCycleView: ICycleView = {
    let cycleView = ICycleView(frame: CGRect(x: 0, y: 345, width: UIScreen.main.bounds.width, height: 130*scaleForPlus))
    cycleView.register([UINib.init(nibName: "CustomCycleViewCell", bundle: nil)], identifiers: ["CustomCell"])
    cycleView.delegate = self
    view.addSubview(cycleView)
    return cycleView
}()

// 图片赋值
customPictureCellCycleView.pictures = pictures

// 代理方法

/**
 - 协议方法都是可选方法，根据需要实现即可
 */
// MARK: ICycleViewDelegate
extension ViewController: ICycleViewDelegate {

    // 图片点击
    func iCycleView(cycleView: ICycleView, didSelectItemAt index: Int) {
        print("你点击了第 \(index) 张图片")
    }

    // 图片自动滚动
    func iCycleView(cycleView: ICycleView, autoScrollingItemAt index: Int) {
        print("当前滚动的图片是第 \(index) 张")
    }

    // 自定义Cell
    func iCycleView(cycleView: ICycleView, collectionView: UICollectionView, cellForItemAt indexPath: IndexPath, picture: String) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CustomCell", for: indexPath) as! CustomCycleViewCell
        cell.imgView.kf.setImage(with: URL(string: picture))
        cell.titleLab.text = "自定义Cell\n第 \(indexPath.item) 张图片"
        return cell
    }

}

Implementation

实现原理 [详细]

  1. collectionView的cell显示两倍数量的图片，展示图片分为两组，默认显示第二组的第一张
  2. 左滑collectionView到第二组最后一张，即最后一个cell时，设置scrollView的contentOffset显示第一组的最后一张，继续左滑，实现了无限左滑
  3. 右滑collectionView到第一组第一张，即第一cell时，设置scrollView的contentOffset显示第二组的第一张，继续右滑，实现了无限右滑
  4. 由2，3实现无限循环

主要代码

// MARK: - 监听手动减速完成(停止滚动)
public func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
    let offsetX = scrollView.contentOffset.x
    let page = Int(offsetX / bounds.size.width)
    let itemsCount = collectionView.numberOfItems(inSection: 0)
    if page == 0 {
        // 第一页
        collectionView.contentOffset = CGPoint(x: offsetX + CGFloat(pictures.count) * bounds.size.width, y: 0)
    } else if page == itemsCount - 1 {
        // 最后一页
        collectionView.contentOffset = CGPoint(x: offsetX - CGFloat(pictures.count) * bounds.size.width, y: 0)
    }
}

Contact

QQ: 2256472253
Email: [email protected]

License

ICycleView is released under the MIT license. See LICENSE for details.