refactor: split reader architecture and chrome handling

2026-05-31 21:47:54 +08:00
parent ea21c6a831
commit 44202357c0
80 changed files with 10635 additions and 8522 deletions
@@ -0,0 +1,49 @@
+import UIKit
+
+/// UICollectionView 数据源和自定义布局代理实现
+/// 处理水平滚动和垂直滚动两种翻页模式
+extension RDReaderView: UICollectionViewDataSource, RDReaderFlowLayoutDelegate, RDReaderFlowLayoutDataSoure {
+    /// 配置 UICollectionViewCell
+    /// 通过 DataSource 获取页面内容视图，支持 cell 复用和预加载视图复用
+    /// RTL 水平模式下翻转 cell 内容使文字方向正常
+    public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
+
+        if let identifer = pageReuseIdentifier(for: indexPath.row) {
+            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: identifer, for: IndexPath(item: indexPath.row, section: 0)) as! RDReaderContentCell
+            let preloadedView = preloadController.takePreloadedView(for: indexPath.row)
+            let reusableView = cell.containerView ?? preloadedView
+            cell.containerView = contentViewForPage(indexPath.row, reusableView: reusableView)
+            // RTL 水平模式：翻转 cell 内容使文字方向正常（collectionView 已整体翻转）
+            if pageDirection == .rightToLeft && currentDisplayType != .verticalScroll {
+                cell.contentView.transform = CGAffineTransform(scaleX: -1, y: 1)
+            } else {
+                cell.contentView.transform = .identity
+            }
+            return cell
+        }
+
+        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: NSStringFromClass(UICollectionViewCell.self), for: indexPath)
+
+        return cell
+    }
+
+    /// 返回每组的 item 数量，即总页数
+    public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
+        return numberOfPages()
+    }
+
+    /// 布局代理回调：当前可见页码变化时通知
+    public func pageNum(flowLayout: RDReaderFlowLayout, pageIndex: Int) {
+        if currentPage >= 0, currentPage != pageIndex {
+            predictedPageDirection = pageIndex >= currentPage
+        }
+        currentPage = pageIndex
+        primePageCache(around: pageIndex, preferredForward: predictedPageDirection)
+    }
+
+    /// 布局数据源回调：返回垂直滚动模式下指定页的高度
+    /// 当前返回 nil 使用默认高度
+    public func heigtOfVerticalScrollPage(flowLayout: RDReaderFlowLayout, pageIndex: Int) -> CGFloat? {
+        return nil
+    }
+}