目前阅读稳定版本，需要修改图片阅读方式

2026-05-23 15:50:53 +08:00
parent d7339aa255
commit 3e2669d8a8
7 changed files with 450 additions and 9 deletions
@@ -1,6 +1,10 @@
 import UIKit
 import Foundation

+#if canImport(DTCoreText)
+import DTCoreText
+#endif
+
 protocol RDEPUBTextContentViewDelegate: AnyObject {
    func textContentView(_ contentView: RDEPUBTextContentView, didChangeSelection selection: RDEPUBSelection?)
    func textContentView(_ contentView: RDEPUBTextContentView, didRequestSelectionAction action: RDEPUBAnnotationMenuAction)
@@ -50,6 +54,13 @@ final class RDEPUBTextContentView: UIView {
        return view
    }()

+    private let coverImageView: UIImageView = {
+        let view = UIImageView()
+        view.contentMode = .scaleAspectFit
+        view.isHidden = true
+        return view
+    }()
+
    private let pageNumberLabel: UILabel = {
        let label = UILabel()
        label.font = UIFont.systemFont(ofSize: 13)
@@ -58,6 +69,7 @@ final class RDEPUBTextContentView: UIView {

    override init(frame: CGRect) {
        super.init(frame: frame)
+        addSubview(coverImageView)
        addSubview(textView)
        addSubview(pageNumberLabel)
        textView.delegate = self
@@ -80,6 +92,7 @@ final class RDEPUBTextContentView: UIView {
        super.layoutSubviews()

        textView.frame = bounds.inset(by: contentInsets)
+        coverImageView.frame = bounds.inset(by: contentInsets)

        let labelSize = pageNumberLabel.sizeThatFits(CGSize(width: bounds.width, height: 20))
        pageNumberLabel.frame = CGRect(
@@ -105,6 +118,17 @@ final class RDEPUBTextContentView: UIView {
        pageNumberLabel.textColor = configuration.theme.contentTextColor
        pageNumberLabel.text = "\(pageNumber) / \(totalPages)"

+        if configureCoverIfNeeded(for: page) {
+            textView.attributedText = nil
+            textView.selectedRange = NSRange(location: 0, length: 0)
+            delegate?.textContentView(self, didChangeSelection: nil)
+            setNeedsLayout()
+            return
+        }
+
+        coverImageView.isHidden = true
+        coverImageView.image = nil
+
        let displayContent = NSMutableAttributedString(attributedString: page.content)
        let fullRange = NSRange(location: 0, length: displayContent.length)
        displayContent.addAttribute(
@@ -112,6 +136,7 @@ final class RDEPUBTextContentView: UIView {
            value: configuration.theme.contentTextColor,
            range: fullRange
        )
+        normalizeInlineAttachments(in: displayContent, basePointSize: configuration.fontSize)
        applyHighlights(to: displayContent, page: page)
        applySearchHighlights(to: displayContent, page: page, searchState: searchState)
        textView.tintColor = configuration.theme.toolControlTextColor
@@ -189,6 +214,73 @@ final class RDEPUBTextContentView: UIView {
        return lowerBound..<max(upperBound, lowerBound)
    }

+    private func configureCoverIfNeeded(for page: RDEPUBTextPage) -> Bool {
+        guard page.pageIndexInChapter == 0,
+              page.href.lowercased().contains("cover"),
+              let image = coverImage(from: page.content) else {
+            return false
+        }
+
+        coverImageView.image = image
+        coverImageView.isHidden = false
+        textView.attributedText = nil
+        return true
+    }
+
+    private func coverImage(from content: NSAttributedString) -> UIImage? {
+        guard content.length > 0 else { return nil }
+        var resolvedImage: UIImage?
+        content.enumerateAttribute(.attachment, in: NSRange(location: 0, length: content.length)) { value, _, stop in
+            guard let image = image(from: value) else { return }
+            resolvedImage = image
+            stop.pointee = true
+        }
+        return resolvedImage
+    }
+
+    private func image(from attachmentValue: Any?) -> UIImage? {
+#if canImport(DTCoreText)
+        if let attachment = attachmentValue as? DTTextAttachment,
+           let url = attachment.contentURL {
+            return UIImage(contentsOfFile: url.path)
+        }
+#endif
+        if let attachment = attachmentValue as? NSTextAttachment {
+            if let image = attachment.image {
+                return image
+            }
+            if let data = attachment.contents {
+                return UIImage(data: data)
+            }
+            if let fileWrapper = attachment.fileWrapper,
+               let data = fileWrapper.regularFileContents {
+                return UIImage(data: data)
+            }
+        }
+        return nil
+    }
+
+    private func normalizeInlineAttachments(in content: NSMutableAttributedString, basePointSize: CGFloat) {
+        guard content.length > 0 else { return }
+        content.enumerateAttribute(.attachment, in: NSRange(location: 0, length: content.length)) { value, range, _ in
+#if canImport(DTCoreText)
+            if let attachment = value as? DTTextAttachment {
+                let classes = ((attachment.attributes["class"] as? String) ?? "").lowercased()
+                let source = (attachment.contentURL?.lastPathComponent ?? (attachment.attributes["src"] as? String) ?? "").lowercased()
+                guard classes.contains("qqreader-footnote") || source.contains("note.png") else { return }
+
+                let pointSize = max(basePointSize, 1)
+                let targetHeight = max(round(pointSize * 0.14), 1)
+                let aspectRatio = attachment.originalSize.height > 0 ? attachment.originalSize.width / attachment.originalSize.height : 1
+                let targetWidth = max(round(targetHeight * max(aspectRatio, 0.1)), 1)
+                attachment.displaySize = CGSize(width: targetWidth, height: targetHeight)
+                attachment.verticalAlignment = .center
+                content.addAttribute(.attachment, value: attachment, range: range)
+            }
+#endif
+        }
+    }
+
 }

 extension RDEPUBTextContentView: UITextViewDelegate {