105 lines
4.3 KiB
Swift
105 lines
4.3 KiB
Swift
import UIKit
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/// 试读墙支持。
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///
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/// 设计：`pageCountOfReaderView` 仍返回原始内容页数（内容页显示的总页数不受影响），
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/// 仅 `numberOfPages(in:)` 在启用试读墙时 +1；试读墙页固定位于最后一个可读页之后。
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/// 两种形态统一覆盖：
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/// - readoor 独立试读 epub（整本都是试读章节）：readableChapterCount 传 nil，墙追加在全书末尾；
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/// - 整本 epub + 按章限制：readableChapterCount 传 N，超出章节页不展示（仅 bookPageMap 路径）。
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extension RDEPUBReaderController {
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/// 试读墙视图（首次访问经 delegate 获取并缓存）
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var trialWallView: UIView? {
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if let cached = cachedTrialWallView {
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return cached
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}
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guard configuration.trialPolicy != nil else { return nil }
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let view = delegate?.epubReaderTrialWallView(self)
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cachedTrialWallView = view
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return view
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}
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/// 是否启用试读墙：配置了试读策略且宿主提供了墙视图
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var isTrialWallEnabled: Bool {
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configuration.trialPolicy != nil && trialWallView != nil
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}
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/// 原始可读内容页数（不含试读墙页）。
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/// readableChapterCount 指定且存在 bookPageMap 时按章截断，否则为全部内容页。
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var readableContentPageCount: Int {
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let rawCount = pageCountOfReaderView(readerView: readerView)
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guard let policy = configuration.trialPolicy,
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let readableChapterCount = policy.readableChapterCount,
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readableChapterCount > 0,
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let pageMap = readerContext.bookPageMap else {
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return rawCount
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}
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// 第一个不可读章节（spineIndex >= readableChapterCount）的起始绝对页 = 可读页数
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let firstLockedStart = pageMap.entries
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.first { $0.spineIndex >= readableChapterCount }?
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.absolutePageStart
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return firstLockedStart ?? rawCount
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}
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/// 试读墙页的绝对索引（0-based）；未启用时为 nil
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var trialWallPageIndex: Int? {
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guard isTrialWallEnabled else { return nil }
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return readableContentPageCount
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}
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/// 供 RDEpubReaderView 使用的有效页数：启用试读墙时为可读页数 + 1（墙页）
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var effectiveNumberOfPages: Int {
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guard isTrialWallEnabled else {
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return pageCountOfReaderView(readerView: readerView)
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}
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return readableContentPageCount + 1
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}
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func isReadableTableOfContentsLocation(_ location: RDEPUBLocation) -> Bool {
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guard let policy = configuration.trialPolicy,
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let readableChapterCount = policy.readableChapterCount else {
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return true
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}
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guard let spineIndex = readerContext.normalizedSpineIndex(for: location) else {
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return true
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}
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return spineIndex < readableChapterCount
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}
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/// 构建试读墙页承载视图（铺满一页，居中放置宿主提供的墙视图）
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func makeTrialWallPageView(reusableView: UIView?) -> UIView {
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let container = (reusableView as? RDEPUBTrialWallContainerView) ?? RDEPUBTrialWallContainerView()
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container.setWallView(trialWallView)
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return container
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}
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}
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/// 试读墙页容器：让宿主墙视图铺满整页
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final class RDEPUBTrialWallContainerView: UIView, RDEpubReaderCachePolicyProviding {
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/// 宿主只提供一份试读墙 View。预加载会同时构建多个页容器，若缓存该容器会
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/// 把同一 View 从实际可见页移走，最终表现为横竖翻页的试读墙白屏。
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var shouldAvoidReaderPageCaching: Bool { true }
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private weak var wallView: UIView?
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func setWallView(_ view: UIView?) {
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// 即使 View 对象相同，只要它已被其他复用容器接管，也必须重新挂回当前页。
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if wallView === view, view?.superview === self {
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return
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}
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wallView?.removeFromSuperview()
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guard let view else { return }
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view.translatesAutoresizingMaskIntoConstraints = false
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addSubview(view)
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NSLayoutConstraint.activate([
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view.leadingAnchor.constraint(equalTo: leadingAnchor),
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view.trailingAnchor.constraint(equalTo: trailingAnchor),
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view.topAnchor.constraint(equalTo: topAnchor),
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view.bottomAnchor.constraint(equalTo: bottomAnchor)
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])
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wallView = view
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}
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}
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