修复 EPUB 与 PDF 阅读器朗读交互
PDF 朗读的逐词回调会在同一页内持续触发高亮，原实现每次都调用翻页入口，使用户在朗读过程中反复看到页面转场。现仅在目标页变化时定位，并对朗读产生的跨页定位禁用动画，保留高亮刷新而不重复翻页。\n\nEPUB/TXT 此前只提供内容源，缺少将朗读进度回写到阅读器的会话层，无法从当前阅读位置开始朗读、随内容跨页及显示临时高亮。新增 EPUB 朗读会话，使用 href 与 UTF-16 偏移恢复位置；文本重排 EPUB 与 TXT 按实际页面定位并高亮，Web EPUB 则按章节安全定位以避免词级回调导致跳页。URL 阅读器同时提供可选会话入口，图片型阅读器保持不可朗读。\n\n已执行 ReadViewDemo 的 Debug Simulator 构建，结果为 BUILD SUCCEEDED。
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shenlei
@@ -225,7 +225,8 @@ public final class RDEpubURLReaderController: UIViewController {
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emitDemoState()
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}
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private var readerController: RDEPUBReaderController? {
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/// 供 `Speech` 子模块桥接已嵌入的文本阅读器；不作为基础 Pod 的公开 API。
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var readerController: RDEPUBReaderController? {
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embeddedController as? RDEPUBReaderController
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}
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@@ -0,0 +1,130 @@
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import Foundation
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import RDSpeechReaderView
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/// EPUB/TXT 朗读会话。它负责把通用朗读进度映射回阅读器的页码和临时高亮，
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/// 但不会写入用户的高亮或批注持久化数据。
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@MainActor
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public final class RDEPUBSpeechSession: NSObject, RDSpeechReaderControllerDelegate {
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public let controller: RDSpeechReaderController
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public let contentProvider: RDEPUBSpeechContentProvider
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public var onStateChange: ((RDSpeechReaderState) -> Void)?
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private weak var reader: RDEPUBReaderController?
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init(reader: RDEPUBReaderController, configuration: RDSpeechReaderConfiguration) {
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self.reader = reader
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contentProvider = reader.makeSpeechContentProvider()
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controller = RDSpeechReaderController(contentProvider: contentProvider, configuration: configuration)
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super.init()
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controller.delegate = self
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}
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/// 默认从当前阅读位置所在章节开始；可传入已保存的朗读位置继续播放。
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public func start(from location: RDSpeechLocation? = nil) async throws {
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try await controller.start(from: location ?? currentSpeechLocation())
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}
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public func pause() { controller.pause() }
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public func resume() { controller.resume() }
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public func stop() {
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controller.stop()
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reader?.clearTransientHighlights()
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}
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public func speechReaderController(_ controller: RDSpeechReaderController, didChange state: RDSpeechReaderState) {
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switch state {
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case .idle, .finished, .failed:
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reader?.clearTransientHighlights()
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case .preparing, .speaking, .paused:
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break
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}
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onStateChange?(state)
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}
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public func speechReaderController(_ controller: RDSpeechReaderController, willSpeak range: RDSpeechSpokenRange) {
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guard let reader else { return }
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let href = range.unit.location.resourceIdentifier
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let absoluteRange = NSRange(
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location: range.unit.textRange.location + range.range.location,
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length: max(range.range.length, 1)
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)
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if let chapterData = reader.textChapterData(forNormalizedHref: href),
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chapterData.attributedContent.length > 0 {
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let boundedLocation = min(max(absoluteRange.location, 0), max(chapterData.attributedContent.length - 1, 0))
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let boundedLength = min(max(absoluteRange.length, 1), max(chapterData.attributedContent.length - boundedLocation, 1))
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let boundedRange = NSRange(location: boundedLocation, length: boundedLength)
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if let page = chapterData.page(containing: boundedRange.location),
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reader.currentPageNumber != page.absolutePageIndex + 1 {
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_ = reader.go(toPageNumber: page.absolutePageIndex + 1, animated: false)
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}
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let highlight = RDEPUBHighlight(
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id: "rd-speech-highlight",
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bookIdentifier: reader.currentBookIdentifier,
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location: chapterData.location(for: boundedRange, bookIdentifier: reader.currentBookIdentifier),
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text: chapterData.attributedContent.attributedSubstring(from: boundedRange).string,
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rangeInfo: RDEPUBTextOffsetRangeInfo(
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href: chapterData.href,
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start: boundedRange.location,
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end: NSMaxRange(boundedRange)
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).jsonString(),
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style: .highlight,
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color: "#86D7FF"
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)
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reader.setTransientHighlights([highlight])
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return
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}
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// Web EPUB 不具备与原始 HTML 文本严格一致的原生文本索引。按章节定位，
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// 并禁用临时文字高亮，避免把一个词级回调误判为多次页面跳转。
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if reader.currentLocation?.href != href {
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reader.go(to: RDEPUBLocation(
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bookIdentifier: reader.currentBookIdentifier,
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href: href,
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progression: progression(for: range)
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))
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}
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reader.clearTransientHighlights()
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}
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private func currentSpeechLocation() -> RDSpeechLocation? {
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guard let reader,
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let location = reader.currentLocation else {
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return nil
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}
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let offset = reader.textChapterData(forNormalizedHref: location.href)
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.flatMap { $0.absoluteRange(for: location)?.location }
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?? 0
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return RDSpeechLocation(
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bookIdentifier: contentProvider.speechBookDescriptor().identifier,
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resourceIdentifier: location.href,
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textOffset: offset
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)
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}
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private func progression(for range: RDSpeechSpokenRange) -> Double {
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let totalLength = max(range.unit.textRange.location + range.unit.textRange.length, 1)
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let offset = range.unit.textRange.location + range.range.location
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return min(max(Double(offset) / Double(totalLength), 0), 1)
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}
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}
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public extension RDEPUBReaderController {
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func makeSpeechSession(
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configuration: RDSpeechReaderConfiguration = .default
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) -> RDEPUBSpeechSession {
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RDEPUBSpeechSession(reader: self, configuration: configuration)
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}
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}
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public extension RDEpubURLReaderController {
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/// CBZ 等图片阅读器没有可朗读的文字阅读器时返回 `nil`。
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func makeSpeechSession(
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configuration: RDSpeechReaderConfiguration = .default
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) -> RDEPUBSpeechSession? {
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readerController.map { $0.makeSpeechSession(configuration: configuration) }
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}
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}
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