76 lines
3.4 KiB
Swift
76 lines
3.4 KiB
Swift
import UIKit
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/// 内容视图注册和复用扩展
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/// 提供类似 UITableView 的 register/dequeueReusable 机制
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extension RDReaderView {
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/// 注册内容视图类型
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public func register(contentView: UIView.Type, contentViewWithReuseIdentifier identifier: String) {
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contentViews[identifier] = contentView
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collectionView.register(RDReaderContentCell.self, forCellWithReuseIdentifier: identifier)
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}
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/// 获取可复用的内容视图
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/// 优先从当前显示的 cell 中获取，其次创建新实例
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public func dequeueReusableContentView(withReuseIdentifier identifier: String, for pageNum: Int) -> UIView {
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if self.currentDisplayType != .pageCurl, let cell = self.collectionView.cellForItem(at: IndexPath(row: pageNum, section: 0)) as? RDReaderContentCell, let containerView = cell.containerView {
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return containerView
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}
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let contentViewClass = contentViews[identifier]
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assert(contentViewClass != nil, "请调用register(contentView：contentViewWithReuseIdentifier：）")
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var contentView = contentViewClass!.init()
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return contentView
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}
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/// 获取指定页码的内容视图
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/// pageCurl 模式从 PageViewController 获取，滚动模式从 CollectionView cell 获取
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public func pageContentView(pageNum: Int) -> UIView? {
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if currentDisplayType == .pageCurl {
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return (self.pageViewController.viewControllers?.first as? RDReaderPageChildViewController)?.contentView
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} else {
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let cell = collectionView.cellForItem(at: IndexPath(item: pageNum, section: 0)) as? RDReaderContentCell
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return cell?.containerView
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}
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}
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/// 返回当前阅读模式下单页内容容器的实际尺寸。
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/// 优先使用已经显示出来的内容视图尺寸；若页面尚未装载，则回退到当前模式下的理论单页尺寸。
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public func resolvedSinglePageSize(pageNum: Int? = nil) -> CGSize {
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let targetPage = pageNum ?? (currentPage >= 0 ? currentPage : nil)
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if let targetPage,
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let contentView = pageContentView(pageNum: targetPage),
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contentView.bounds.width > 0,
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contentView.bounds.height > 0 {
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return contentView.bounds.size
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}
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if currentDisplayType == .pageCurl {
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if let childViewController = pageViewController.viewControllers?.first as? RDReaderPageChildViewController,
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childViewController.view.bounds.width > 0,
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childViewController.view.bounds.height > 0 {
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return childViewController.view.bounds.size
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}
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if pageViewController.view.bounds.width > 0, pageViewController.view.bounds.height > 0 {
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return pageViewController.view.bounds.size
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}
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return bounds.size
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}
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let containerBounds = collectionView.bounds.size == .zero ? bounds.size : collectionView.bounds.size
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guard containerBounds.width > 0, containerBounds.height > 0 else {
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return bounds.size
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}
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switch currentDisplayType {
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case .horizontalScroll:
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return CGSize(
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width: containerBounds.width / CGFloat(max(pagesPerScreen, 1)),
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height: containerBounds.height
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)
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case .verticalScroll:
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return containerBounds
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case .pageCurl:
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return bounds.size
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}
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}
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}
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