231 lines
9.2 KiB
Swift
231 lines
9.2 KiB
Swift
//
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// RDURLReaderController.swift
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// RDReaderDemo
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//
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// 文件职责：URL 阅读器入口控制器，根据文件类型自动选择阅读器。
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// 该文件是 ReadViewSDK 的最简使用入口：
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// - .epub 文件：直接创建 RDEPUBReaderController
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// - 其他文本文件：通过 RDPlainTextBookBuilder 分页后创建 RDEPUBReaderController
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// - 分页失败时回退到纯文本 UITextView 展示
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//
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// 架构位置：RDReaderView 四层架构中第四层（读者 UI）的入口控制器。
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//
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import UIKit
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/// URL 阅读器入口控制器
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/// 接收一个书籍文件 URL，根据文件类型自动创建对应的阅读器控制器：
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/// - EPUB 文件：直接使用 RDEPUBReaderController
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/// - 纯文本文件：先通过 RDPlainTextBookBuilder 分页，再使用 RDEPUBReaderController
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/// - 分页失败：回退到纯文本 UITextView 展示
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///
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/// 使用方式：
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/// ```swift
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/// let controller = RDURLReaderController(bookURL: fileURL)
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/// navigationController?.pushViewController(controller, animated: true)
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/// ```
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public final class RDURLReaderController: UIViewController {
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/// 书籍文件 URL
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private let bookURL: URL
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/// EPUB 阅读器配置（字体、行距、主题等）
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private let epubConfiguration: RDEPUBReaderConfiguration
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/// 内嵌的阅读器控制器
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private var embeddedController: UIViewController?
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/// 初始化方法
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/// - Parameters:
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/// - bookURL: 书籍文件的本地 URL
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/// - epubConfiguration: EPUB 阅读器配置，默认使用标准配置
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public init(
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bookURL: URL,
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epubConfiguration: RDEPUBReaderConfiguration = RDEPUBReaderConfiguration()
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) {
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self.bookURL = bookURL
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self.epubConfiguration = epubConfiguration
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super.init(nibName: nil, bundle: nil)
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}
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@available(*, unavailable)
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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/// 视图加载完成后，设置背景色、标题并嵌入阅读器控制器
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public override func viewDidLoad() {
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super.viewDidLoad()
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view.backgroundColor = .systemBackground
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title = bookURL.deletingPathExtension().lastPathComponent
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embedReaderController()
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}
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/// 切换阅读器的翻页模式（Demo 用）
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/// - Parameter displayType: 目标翻页模式
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public func applyDemoDisplayType(_ displayType: RDReaderView.DisplayType) {
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readerController?.configuration.displayType = displayType
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logDemoState(prefix: "display=\(displayType.demoArgumentValue)")
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}
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/// 跳转到指定页码（Demo 用）
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/// - Parameters:
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/// - pageNumber: 目标页码
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/// - animated: 是否动画过渡
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/// - Returns: 是否成功跳转
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@discardableResult
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public func goToDemoPage(_ pageNumber: Int, animated: Bool = false) -> Bool {
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let moved = readerController?.go(toPageNumber: pageNumber, animated: animated) ?? false
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if moved {
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logDemoState(prefix: "page=\(pageNumber)")
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}
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return moved
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}
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/// 执行翻页模式切换序列（Demo 用）
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/// 按照指定顺序和延迟依次切换翻页模式
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/// - Parameters:
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/// - displayTypes: 翻页模式数组
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/// - initialPageNumber: 可选的初始跳转页码
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/// - stepDelay: 每步之间的延迟时间（秒）
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public func runDemoDisplaySequence(
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_ displayTypes: [RDReaderView.DisplayType],
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initialPageNumber: Int? = nil,
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stepDelay: TimeInterval = 1.0
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) {
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let normalizedDelay = max(stepDelay, 0.1)
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if let initialPageNumber {
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DispatchQueue.main.asyncAfter(deadline: .now() + normalizedDelay) { [weak self] in
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_ = self?.goToDemoPage(initialPageNumber)
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}
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}
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for (index, displayType) in displayTypes.enumerated() {
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let delay = normalizedDelay * Double(index + 1 + (initialPageNumber == nil ? 0 : 1))
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DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
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self?.applyDemoDisplayType(displayType)
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}
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}
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}
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/// 嵌入阅读器控制器到当前视图层级
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/// 根据文件类型选择合适的阅读器控制器，并通过 Child View Controller 方式嵌入
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private func embedReaderController() {
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let controller: UIViewController
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if bookURL.pathExtension.lowercased() == "epub" {
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controller = RDEPUBReaderController(
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epubURL: bookURL,
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configuration: epubConfiguration
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)
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} else {
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let bookIdentifier = bookURL.lastPathComponent
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let bookTitle = bookURL.deletingPathExtension().lastPathComponent
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let pageSize = currentTextPageSize()
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let renderStyle = currentTextRenderStyle()
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let builder = RDPlainTextBookBuilder(
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layoutConfig: RDEPUBTextLayoutConfig(
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frameWidth: pageSize.width,
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frameHeight: pageSize.height,
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edgeInsets: epubConfiguration.reflowableContentInsets,
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numberOfColumns: 1,
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columnGap: 20,
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avoidOrphans: true,
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avoidWidows: true,
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avoidPageBreakInsideEnabled: true,
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hyphenation: true,
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imageMaxHeightRatio: 0.85
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)
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)
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if let textBook = try? builder.build(textFileURL: bookURL, pageSize: pageSize, style: renderStyle) {
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controller = RDEPUBReaderController(
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textBook: textBook,
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bookIdentifier: bookIdentifier,
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title: bookTitle,
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textFileURL: bookURL,
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configuration: epubConfiguration
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)
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} else {
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// 分页失败时回退到纯文本展示
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let fallback = UIViewController()
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let textView = UITextView()
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textView.isEditable = false
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textView.text = rd_decodeTextFile(url: bookURL)
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fallback.view = textView
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controller = fallback
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}
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}
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embeddedController = controller
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addChild(controller)
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controller.view.translatesAutoresizingMaskIntoConstraints = false
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view.addSubview(controller.view)
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NSLayoutConstraint.activate([
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controller.view.topAnchor.constraint(equalTo: view.topAnchor),
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controller.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
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controller.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
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controller.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
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])
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controller.didMove(toParent: self)
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}
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/// 获取内嵌的 EPUB 阅读器控制器（如果存在）
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private var readerController: RDEPUBReaderController? {
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embeddedController as? RDEPUBReaderController
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}
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/// 输出当前阅读器状态日志（Demo 调试用）
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private func logDemoState(prefix: String) {
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guard let readerController else { return }
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let location = readerController.currentLocation
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let href = location?.href ?? "nil"
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let progression = location.map { String(format: "%.4f", $0.navigationProgression) } ?? "nil"
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let page = readerController.currentPageNumber.map(String.init) ?? "nil"
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print("[ReadViewDemo] automation \(prefix) -> page \(page) href \(href) progression \(progression)")
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}
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/// 计算文本分页的页面尺寸。
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/// 分页器使用完整 viewport，真实可绘制区域由 layoutConfig.edgeInsets 控制，
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/// 以保持与页面展示时的内容几何一致。
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private func currentTextPageSize() -> CGSize {
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UIScreen.main.bounds.size
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}
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/// 根据当前配置生成文本渲染样式
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private func currentTextRenderStyle() -> RDEPUBTextRenderStyle {
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let font = UIFont.systemFont(ofSize: epubConfiguration.fontSize)
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let lineSpacing = max(font.lineHeight * (epubConfiguration.lineHeightMultiple - 1), 4)
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return RDEPUBTextRenderStyle(
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font: font,
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lineSpacing: lineSpacing,
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textColor: epubConfiguration.theme.contentTextColor,
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backgroundColor: epubConfiguration.theme.contentBackgroundColor
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)
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}
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/// 解码文本文件内容
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/// 尝试 UTF-8 编码，失败则尝试 GBK 和 GB2312 编码
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private func rd_decodeTextFile(url: URL) -> String {
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if let content = try? NSString(contentsOf: url, encoding: String.Encoding.utf8.rawValue) as String {
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return content
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}
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if let content = try? NSString(contentsOf: url, encoding: 0x80000632) as String {
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return content
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}
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if let content = try? NSString(contentsOf: url, encoding: 0x80000631) as String {
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return content
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}
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return ""
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}
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}
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/// 翻页模式扩展：提供 Demo 命令行参数值
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private extension RDReaderView.DisplayType {
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/// 返回翻页模式对应的 Demo 命令行参数字符串
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var demoArgumentValue: String {
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switch self {
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case .pageCurl:
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return "pageCurl"
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case .horizontalScroll:
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return "horizontalScroll"
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case .verticalScroll:
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return "verticalScroll"
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}
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}
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}
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