753 lines
31 KiB
Swift
753 lines
31 KiB
Swift
//
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// RDReaderView.swift
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// RDReaderDemo
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//
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// Created by yangsq on 2021/8/6.
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//
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import UIKit
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@objc public protocol RDReaderDataSource: NSObjectProtocol {
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func pageCountOfReaderView(readerView: RDReaderView) -> Int
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func pageContentView(readerView: RDReaderView, pageNum: Int, containerView: UIView?) -> UIView
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func pageIdentifier(readerView: RDReaderView, pageNum: Int) -> String?
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@objc optional func topToolView(readerView: RDReaderView) -> UIView?
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@objc optional func bottomToolView(readerView: RDReaderView) -> UIView?
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}
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@objc public protocol RDReaderDelegate: NSObjectProtocol {
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func pageNum(readerView: RDReaderView, pageNum: Int)
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/// 横竖屏切换时回调，可在此重新分页
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@objc optional func readerViewOrientationWillChange(readerView: RDReaderView, isLandscape: Bool)
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}
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extension RDReaderView {
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public enum DisplayType {
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case pageCurl
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case horizontalScroll
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case verticalScroll
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}
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/// 翻页方向
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public enum PageDirection {
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/// 从左往右翻页（默认，适用于中文/英文书籍）
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case leftToRight
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/// 从右往左翻页（适用于日文漫画等）
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case rightToLeft
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}
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}
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public class RDReaderView: UIView {
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enum TapEvent {
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case none, left, center, right
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}
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private lazy var pageViewController: UIPageViewController = {
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let pageVC = UIPageViewController(transitionStyle: .pageCurl, navigationOrientation: .horizontal, options: nil)
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pageVC.delegate = self
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pageVC.dataSource = self
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return pageVC
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}()
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private lazy var layout: RDReaderFlowLayout = {
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let layout = RDReaderFlowLayout(displayType: .horizontalScroll)
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layout.dataSource = self
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layout.delegate = self
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return layout
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}()
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private lazy var collectionView: UICollectionView = {
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let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
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collectionView.backgroundColor = UIColor.clear
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return collectionView
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}()
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public var currentPage: Int = -1 {
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didSet {
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if let delegate = delegate, currentPage != oldValue, delegate.responds(to: #selector(RDReaderDelegate.pageNum(readerView:pageNum:))) {
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delegate.pageNum(readerView: self, pageNum: currentPage)
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}
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}
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}
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private(set) lazy var tapGestureRecognizer: UITapGestureRecognizer = {
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let tap = UITapGestureRecognizer(target: self, action: #selector(tapAction(tap:)))
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return tap
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}()
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private var tapEvent: TapEvent = .none {
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didSet {
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let isRTL = pageDirection == .rightToLeft
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switch tapEvent {
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case .left:
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if currentDisplayType != .pageCurl {
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if isRTL { goNextPage() } else { goPreviousPage() }
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}
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case .right:
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if currentDisplayType != .pageCurl {
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if isRTL { goPreviousPage() } else { goNextPage() }
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}
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case .center:
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tapCenter()
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default:
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break
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}
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}
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}
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private func goNextPage() {
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let totalPages = dataSource?.pageCountOfReaderView(readerView: self) ?? 0
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if pagesPerScreen > 1 {
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if let target = adjacentDualPage(from: currentPage, forward: true) {
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transitionToPage(pageNum: target, animated: true)
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}
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} else if currentPage + 1 < totalPages {
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transitionToPage(pageNum: currentPage + 1, animated: true)
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}
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}
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private func goPreviousPage() {
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if pagesPerScreen > 1 {
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if let target = adjacentDualPage(from: currentPage, forward: false) {
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transitionToPage(pageNum: target, animated: true)
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}
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} else if currentPage - 1 >= 0 {
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transitionToPage(pageNum: currentPage - 1, animated: true)
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}
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}
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public weak var dataSource: RDReaderDataSource? = nil
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public weak var delegate: RDReaderDelegate? = nil
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public var currentDisplayType: RDReaderView.DisplayType = .pageCurl
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public var toolViewAnimationDuration: TimeInterval = 0.3
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/// 是否启用横屏双页显示
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public var landscapeDualPageEnabled: Bool = false
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/// 翻页方向，默认从左往右（.leftToRight）
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public var pageDirection: RDReaderView.PageDirection = .leftToRight
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/// 横屏双页模式下，封面页的索引。设置后该页在横屏时独占一屏，后续页面两两配对。
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/// 设为 nil 表示没有封面页（所有页面正常两两配对）。
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public var coverPageIndex: Int? = nil
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/// 是否启用了封面页独占
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private var hasCoverPage: Bool {
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return coverPageIndex != nil
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}
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/// 当前是否横屏
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private var isLandscape: Bool {
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return bounds.width > bounds.height
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}
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/// 每屏显示的页数
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public var pagesPerScreen: Int {
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if !landscapeDualPageEnabled { return 1 }
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if currentDisplayType == .verticalScroll { return 1 }
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return isLandscape ? 2 : 1
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}
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/// 判断某页在横屏双页模式下是否独占一屏（封面页）
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/// - Parameter pageNum: 页码
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/// - Returns: 是否独占一屏
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public func isFullScreenPage(_ pageNum: Int) -> Bool {
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guard landscapeDualPageEnabled, isLandscape, let coverIndex = coverPageIndex else { return false }
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return pageNum == coverIndex
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}
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/// 根据逻辑页码计算横屏双页模式下的配对信息
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/// 封面页独占一屏，后续页面两两配对
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/// - Parameter pageNum: 逻辑页码
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/// - Returns: (左页码, 右页码(可选))
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private func dualPagePair(for pageNum: Int) -> (left: Int, right: Int?) {
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let totalPages = dataSource?.pageCountOfReaderView(readerView: self) ?? 0
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if let coverIndex = coverPageIndex {
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if pageNum == coverIndex {
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// 封面页独占一屏
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return (coverIndex, nil)
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}
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// 封面之后的页面：偏移1后两两配对
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// 例如封面是0页，则 1+2, 3+4, 5+6...
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let adjustedIndex = pageNum - (coverIndex + 1) // 跳过封面后的偏移
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let pairStart = coverIndex + 1 + (adjustedIndex / 2) * 2
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let left = pairStart
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let right = pairStart + 1 < totalPages ? pairStart + 1 : nil
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return (left, right)
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} else {
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// 无封面页：正常两两配对 0+1, 2+3, 4+5...
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let left = (pageNum / 2) * 2
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let right = left + 1 < totalPages ? left + 1 : nil
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return (left, right)
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}
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}
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/// 计算横屏双页下，某页往前/后翻一屏后的起始页码
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/// - Parameters:
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/// - pageNum: 当前页码
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/// - forward: 是否向后翻
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/// - Returns: 目标页码，nil 表示到头了
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private func adjacentDualPage(from pageNum: Int, forward: Bool) -> Int? {
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let totalPages = dataSource?.pageCountOfReaderView(readerView: self) ?? 0
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let pair = dualPagePair(for: pageNum)
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if forward {
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let nextStart = (pair.right ?? pair.left) + 1
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return nextStart < totalPages ? nextStart : nil
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} else {
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let prevEnd = pair.left - 1
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guard prevEnd >= 0 else { return nil }
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return dualPagePair(for: prevEnd).left
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}
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}
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private var previousIsLandscape: Bool?
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private var contentViews = [String : UIView.Type]()
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private var willPreviousTransitionToViewController: UIViewController? = nil
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private var willNextTransitionToViewController: UIViewController? = nil
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private var willTransitionToViewController: UIViewController? = nil
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private var topToolView: UIView?
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private var bottomToolView: UIView?
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private var isShowToolView: Bool = false
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private var isTransitioning: Bool = false
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private var didBuildUI = false
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/// 用于 pageCurl 双页模式下封面页旁边的空白页
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static let blankPageNum = Int.max
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/// 用于 pageCurl 双页模式下末尾不成对页旁边的空白页
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static let blankEndPageNum = Int.max - 1
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override init(frame: CGRect) {
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super.init(frame: frame)
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}
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public override func layoutSubviews() {
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super.layoutSubviews()
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guard bounds.width > 0, bounds.height > 0 else { return }
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let nowLandscape = isLandscape
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if let prev = previousIsLandscape, prev != nowLandscape {
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previousIsLandscape = nowLandscape
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// 延迟到下一个 RunLoop 执行，避免在 layoutSubviews 中嵌套触发 reloadData/layoutIfNeeded
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// 造成 collectionView 中间态尺寸不一致的问题
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DispatchQueue.main.async { [weak self] in
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guard let self = self else { return }
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self.orientationChanged(isNowLandscape: nowLandscape)
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}
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} else if previousIsLandscape == nil {
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previousIsLandscape = nowLandscape
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layout.isLandscapeDualPage = landscapeDualPageEnabled && nowLandscape
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}
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}
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/// 横竖屏切换处理
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/// - Parameter isNowLandscape: 当前是否为横屏
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private func orientationChanged(isNowLandscape: Bool) {
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let savedPage = max(0, currentPage)
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// 1. 通知代理方向变化。正文级重分页由上层控制器统一接管，这里只保留容器级刷新钩子。
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delegate?.readerViewOrientationWillChange?(readerView: self, isLandscape: isNowLandscape)
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// 2. 更新布局的横屏双页标记
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layout.isLandscapeDualPage = landscapeDualPageEnabled && isNowLandscape
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layout.coverPageIndex = coverPageIndex
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switch currentDisplayType {
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case .pageCurl:
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// 仿真翻页：通过 spineLocation 原生支持双页，需要重建 PageViewController
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rebuildPageViewController()
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transitionToPage(pageNum: savedPage)
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default:
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// 滚动模式：禁用动画防止旋转过渡中出现尺寸抖动
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UIView.performWithoutAnimation {
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// 强制使布局完全失效并重新计算
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collectionView.collectionViewLayout.invalidateLayout()
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collectionView.reloadData()
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collectionView.layoutIfNeeded()
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// 3. 根据保存的页码恢复滚动位置
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let totalPages = dataSource?.pageCountOfReaderView(readerView: self) ?? 0
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let safePage = min(savedPage, max(0, totalPages - 1))
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let targetOffset = layout.currentContentOffset(count: safePage)
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collectionView.setContentOffset(targetOffset, animated: false)
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}
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}
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}
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/// 创建带指定 spine 位置的 UIPageViewController
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/// - Parameter isDualPage: 是否双页模式（横屏时书脊在中间：.mid）
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private func createPageViewController(isDualPage: Bool) -> UIPageViewController {
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let options: [UIPageViewController.OptionsKey: Any]?
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if isDualPage {
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options = [.spineLocation: NSNumber(value: UIPageViewController.SpineLocation.mid.rawValue)]
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} else {
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options = nil
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}
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let pageVC = UIPageViewController(transitionStyle: .pageCurl, navigationOrientation: .horizontal, options: options)
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pageVC.delegate = self
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pageVC.dataSource = self
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pageVC.isDoubleSided = isDualPage
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return pageVC
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}
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/// 重建 UIPageViewController。横竖屏切换时需要重建，因为 spineLocation 只能在初始化时设置
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private func rebuildPageViewController() {
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detachPageViewControllerIfNeeded()
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let isDualPage = landscapeDualPageEnabled && isLandscape
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let pageVC = createPageViewController(isDualPage: isDualPage)
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pageViewController = pageVC
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attachPageViewControllerIfNeeded()
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}
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public override func didMoveToSuperview() {
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super.didMoveToSuperview()
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if superview != nil {
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makeUI()
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}
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}
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private func attachPageViewControllerIfNeeded() {
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guard let parentViewController = self.ss_superViewController else { return }
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var didAddToParent = false
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if pageViewController.parent !== parentViewController {
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if pageViewController.parent != nil {
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pageViewController.willMove(toParent: nil)
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pageViewController.view.removeFromSuperview()
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pageViewController.removeFromParent()
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}
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parentViewController.addChild(pageViewController)
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didAddToParent = true
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}
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pageViewController.view.frame = CGRect(x: 0, y: 0, width: frame.width, height: frame.height)
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pageViewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
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if pageViewController.view.superview !== self {
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insertSubview(pageViewController.view, at: 0)
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}
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if didAddToParent {
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pageViewController.didMove(toParent: parentViewController)
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}
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}
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private func detachPageViewControllerIfNeeded() {
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if pageViewController.parent != nil {
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pageViewController.willMove(toParent: nil)
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}
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pageViewController.view.removeFromSuperview()
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if pageViewController.parent != nil {
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pageViewController.removeFromParent()
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}
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}
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private func makeUI() {
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guard !didBuildUI else {
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if currentDisplayType == .pageCurl {
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attachPageViewControllerIfNeeded()
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}
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return
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}
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didBuildUI = true
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collectionView.dataSource = self
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collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: NSStringFromClass(UICollectionViewCell.self))
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collectionView.frame = CGRect(x: 0, y: 0, width: frame.width, height: frame.height)
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collectionView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
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if currentDisplayType == .pageCurl {
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attachPageViewControllerIfNeeded()
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}
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addGestureRecognizer(tapGestureRecognizer)
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// 不取消底层触摸事件，确保工具栏按钮（返回等）的 touchUpInside 能正常触发
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tapGestureRecognizer.cancelsTouchesInView = false
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}
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@objc private func tapAction(tap: UITapGestureRecognizer) {
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let point = tap.location(in: tap.view)
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if isShowToolView {
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let hitView = hitTest(point, with: nil)
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if let top = topToolView, isHitView(hitView, inside: top, point: point) { return }
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if let bottom = bottomToolView, isHitView(hitView, inside: bottom, point: point) { return }
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}
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let viewFrame = tap.view!.frame
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let leftFrame = CGRect(x: 0, y: 0, width: viewFrame.width / 3, height: viewFrame.height)
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let centerFrame = CGRect(x: viewFrame.width / 3, y: 0, width: viewFrame.width / 3, height: viewFrame.height)
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let rightFrame = CGRect(x: viewFrame.width * 2 / 3, y: 0, width: viewFrame.width / 3, height: viewFrame.height)
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if leftFrame.contains(point) {
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if isShowToolView {
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tapEvent = .center
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} else {
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tapEvent = .left
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}
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}
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if centerFrame.contains(point) {
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tapEvent = .center
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}
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if rightFrame.contains(point) {
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if isShowToolView {
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tapEvent = .center
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} else {
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tapEvent = .right
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}
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}
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}
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private func tapCenter() {
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isShowToolView = !isShowToolView
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if isShowToolView {
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if let topToolView = topToolView {
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addSubview(topToolView)
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topToolView.translatesAutoresizingMaskIntoConstraints = false
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NSLayoutConstraint.activate([
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topToolView.leadingAnchor.constraint(equalTo: leadingAnchor),
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topToolView.trailingAnchor.constraint(equalTo: trailingAnchor),
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topToolView.topAnchor.constraint(equalTo: topAnchor)
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])
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layoutIfNeeded()
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topToolView.transform = CGAffineTransform(translationX: 0, y: -topToolView.bounds.height)
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UIView.animate(withDuration: toolViewAnimationDuration) {
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topToolView.transform = .identity
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}
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}
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if let bottomToolView = bottomToolView {
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addSubview(bottomToolView)
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bottomToolView.translatesAutoresizingMaskIntoConstraints = false
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NSLayoutConstraint.activate([
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bottomToolView.leadingAnchor.constraint(equalTo: leadingAnchor),
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bottomToolView.trailingAnchor.constraint(equalTo: trailingAnchor),
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bottomToolView.bottomAnchor.constraint(equalTo: bottomAnchor)
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])
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layoutIfNeeded()
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bottomToolView.transform = CGAffineTransform(translationX: 0, y: bottomToolView.bounds.height)
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UIView.animate(withDuration: toolViewAnimationDuration) {
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bottomToolView.transform = .identity
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}
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}
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collectionView.isUserInteractionEnabled = false
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pageViewController.view.isUserInteractionEnabled = false
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} else {
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if let topToolView = topToolView {
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UIView.animate(withDuration: toolViewAnimationDuration, animations: {
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topToolView.transform = CGAffineTransform(translationX: 0, y: -topToolView.bounds.height)
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}) { _ in
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topToolView.removeFromSuperview()
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}
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}
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if let bottomToolView = bottomToolView {
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UIView.animate(withDuration: toolViewAnimationDuration, animations: {
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bottomToolView.transform = CGAffineTransform(translationX: 0, y: bottomToolView.bounds.height)
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}) { _ in
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bottomToolView.removeFromSuperview()
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}
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}
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collectionView.isUserInteractionEnabled = true
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pageViewController.view.isUserInteractionEnabled = true
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}
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}
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private func isHitView(_ hitView: UIView?, inside toolView: UIView, point: CGPoint) -> Bool {
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if toolView.frame.contains(point) {
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return true
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}
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guard let hitView else { return false }
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return hitView === toolView || hitView.isDescendant(of: toolView)
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}
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/// 切换翻页模式（仿真/水平滚动/上下滚动）
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/// 会重建底层视图（PageViewController 或 CollectionView），并恢复到当前页
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public func switchReaderDisplayType(_ displayType: RDReaderView.DisplayType) {
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self.currentDisplayType = displayType
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if currentPage == -1 {
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currentPage = 0
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}
|
||
// 同步横屏双页标记到布局
|
||
layout.isLandscapeDualPage = landscapeDualPageEnabled && isLandscape
|
||
layout.coverPageIndex = coverPageIndex
|
||
switch displayType {
|
||
case .pageCurl:
|
||
self.collectionView.removeFromSuperview()
|
||
self.collectionView.transform = .identity
|
||
attachPageViewControllerIfNeeded()
|
||
rebuildPageViewController()
|
||
transitionToPage(pageNum: currentPage)
|
||
default:
|
||
detachPageViewControllerIfNeeded()
|
||
// RTL 水平模式翻转 collectionView
|
||
if pageDirection == .rightToLeft && displayType != .verticalScroll {
|
||
collectionView.transform = CGAffineTransform(scaleX: -1, y: 1)
|
||
} else {
|
||
collectionView.transform = .identity
|
||
}
|
||
// 确保 collectionView frame 正确后再触发布局计算
|
||
collectionView.frame = CGRect(x: 0, y: 0, width: frame.width, height: frame.height)
|
||
insertSubview(self.collectionView, at: 0)
|
||
layout.displayType = displayType
|
||
transitionToPage(pageNum: currentPage)
|
||
}
|
||
}
|
||
|
||
/// 跳转到指定页码
|
||
/// - Parameters:
|
||
/// - pageNum: 目标页码（item 索引）
|
||
/// - animated: 是否动画过渡
|
||
public func transitionToPage(pageNum: Int, animated: Bool = false) {
|
||
switch currentDisplayType {
|
||
case .pageCurl:
|
||
let isDualPage = landscapeDualPageEnabled && isLandscape
|
||
// RTL 时动画方向需要反转
|
||
let direction: UIPageViewController.NavigationDirection
|
||
if pageDirection == .rightToLeft {
|
||
direction = pageNum > currentPage ? .reverse : .forward
|
||
} else {
|
||
direction = pageNum > currentPage ? .forward : .reverse
|
||
}
|
||
if isDualPage {
|
||
let pair = dualPagePair(for: pageNum)
|
||
let leftContent = dataSource?.pageContentView(readerView: self, pageNum: pair.left, containerView: nil)
|
||
let leftVC = RDReaderPageChildViewController(contentView: leftContent, pageNum: pair.left)
|
||
if let rightPage = pair.right {
|
||
let rightContent = dataSource?.pageContentView(readerView: self, pageNum: rightPage, containerView: nil)
|
||
let rightVC = RDReaderPageChildViewController(contentView: rightContent, pageNum: rightPage)
|
||
pageViewController.setViewControllers([leftVC, rightVC], direction: animated ? direction : .forward, animated: animated, completion: nil)
|
||
} else {
|
||
// 封面页独占或奇数最后一页：右侧放空白页
|
||
let blankNum = isFullScreenPage(pair.left) ? RDReaderView.blankPageNum : RDReaderView.blankEndPageNum
|
||
let emptyVC = RDReaderPageChildViewController(contentView: UIView(), pageNum: blankNum)
|
||
pageViewController.setViewControllers([leftVC, emptyVC], direction: animated ? direction : .forward, animated: animated, completion: nil)
|
||
}
|
||
currentPage = pair.left
|
||
} else {
|
||
let contentView = dataSource?.pageContentView(readerView: self, pageNum: pageNum, containerView: nil)
|
||
let vc = RDReaderPageChildViewController(contentView: contentView, pageNum: pageNum)
|
||
pageViewController.setViewControllers([vc], direction: animated ? direction : .forward, animated: animated, completion: nil)
|
||
currentPage = pageNum
|
||
}
|
||
default:
|
||
collectionView.reloadData()
|
||
collectionView.layoutIfNeeded()
|
||
collectionView.setContentOffset(layout.currentContentOffset(count: pageNum), animated: animated)
|
||
}
|
||
}
|
||
|
||
public func reloadData() {
|
||
switchReaderDisplayType(currentDisplayType)
|
||
topToolView = self.dataSource?.topToolView?(readerView: self)
|
||
bottomToolView = self.dataSource?.bottomToolView?(readerView: self)
|
||
}
|
||
|
||
|
||
required init?(coder: NSCoder) {
|
||
fatalError("init(coder:) has not been implemented")
|
||
}
|
||
|
||
}
|
||
|
||
|
||
|
||
extension RDReaderView: UIPageViewControllerDataSource, UIPageViewControllerDelegate {
|
||
|
||
private func makeSinglePageChildVC(for pageNum: Int) -> RDReaderPageChildViewController {
|
||
if pageNum == RDReaderView.blankPageNum || pageNum == RDReaderView.blankEndPageNum {
|
||
return RDReaderPageChildViewController(contentView: UIView(), pageNum: pageNum)
|
||
}
|
||
let contentView = dataSource?.pageContentView(readerView: self, pageNum: pageNum, containerView: nil)
|
||
return RDReaderPageChildViewController(contentView: contentView, pageNum: pageNum)
|
||
}
|
||
|
||
/// 计算某页的"下一页"页码（考虑封面页插入空白页）
|
||
private func nextPageNum(after pageNum: Int, isDualPage: Bool) -> Int? {
|
||
let totalPages = dataSource?.pageCountOfReaderView(readerView: self) ?? 0
|
||
|
||
// 末尾空白页之后没有更多页
|
||
if pageNum == RDReaderView.blankEndPageNum {
|
||
return nil
|
||
}
|
||
|
||
if isDualPage, let coverIndex = coverPageIndex {
|
||
if pageNum == coverIndex {
|
||
return RDReaderView.blankPageNum
|
||
}
|
||
if pageNum == RDReaderView.blankPageNum {
|
||
let firstContent = coverIndex + 1
|
||
return firstContent < totalPages ? firstContent : nil
|
||
}
|
||
}
|
||
|
||
let next = pageNum + 1
|
||
if next < totalPages {
|
||
return next
|
||
}
|
||
|
||
// pageNum 是最后一页，检查在双页模式下是否需要空白页配对
|
||
if isDualPage {
|
||
if let coverIndex = coverPageIndex {
|
||
// 有封面时：封面之后的页面两两配对，偶数偏移=左页需要配对
|
||
let adjustedIndex = pageNum - (coverIndex + 1)
|
||
if adjustedIndex >= 0 && adjustedIndex % 2 == 0 {
|
||
return RDReaderView.blankEndPageNum
|
||
}
|
||
} else {
|
||
// 无封面：偶数索引=左页需要配对
|
||
if pageNum % 2 == 0 {
|
||
return RDReaderView.blankEndPageNum
|
||
}
|
||
}
|
||
}
|
||
return nil
|
||
}
|
||
|
||
/// 计算某页的"上一页"页码（考虑封面页插入空白页）
|
||
private func prevPageNum(before pageNum: Int, isDualPage: Bool) -> Int? {
|
||
// 末尾空白页的前一页是最后一个真实页
|
||
if pageNum == RDReaderView.blankEndPageNum {
|
||
let totalPages = dataSource?.pageCountOfReaderView(readerView: self) ?? 0
|
||
return totalPages > 0 ? totalPages - 1 : nil
|
||
}
|
||
if isDualPage, let coverIndex = coverPageIndex {
|
||
if pageNum == RDReaderView.blankPageNum {
|
||
return coverIndex
|
||
}
|
||
if pageNum == coverIndex + 1 {
|
||
return RDReaderView.blankPageNum
|
||
}
|
||
}
|
||
let prev = pageNum - 1
|
||
return prev >= 0 ? prev : nil
|
||
}
|
||
|
||
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
|
||
guard let vc = viewController as? RDReaderPageChildViewController else { return nil }
|
||
let isDualPage = landscapeDualPageEnabled && isLandscape
|
||
let isRTL = pageDirection == .rightToLeft
|
||
|
||
// RTL 时 before/after 语义互换：before（向右翻）= 下一页
|
||
let targetNum = isRTL
|
||
? nextPageNum(after: vc.pageNum, isDualPage: isDualPage)
|
||
: prevPageNum(before: vc.pageNum, isDualPage: isDualPage)
|
||
|
||
guard let num = targetNum else { return nil }
|
||
let targetVC = makeSinglePageChildVC(for: num)
|
||
willPreviousTransitionToViewController = targetVC
|
||
return targetVC
|
||
}
|
||
|
||
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
|
||
guard let vc = viewController as? RDReaderPageChildViewController else { return nil }
|
||
let isDualPage = landscapeDualPageEnabled && isLandscape
|
||
let isRTL = pageDirection == .rightToLeft
|
||
|
||
let targetNum = isRTL
|
||
? prevPageNum(before: vc.pageNum, isDualPage: isDualPage)
|
||
: nextPageNum(after: vc.pageNum, isDualPage: isDualPage)
|
||
|
||
guard let num = targetNum else { return nil }
|
||
let targetVC = makeSinglePageChildVC(for: num)
|
||
willNextTransitionToViewController = targetVC
|
||
return targetVC
|
||
}
|
||
|
||
public func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
|
||
if completed, let firstVC = pageViewController.viewControllers?.first as? RDReaderPageChildViewController {
|
||
let pn = firstVC.pageNum
|
||
if pn != RDReaderView.blankPageNum && pn != RDReaderView.blankEndPageNum {
|
||
currentPage = pn
|
||
}
|
||
}
|
||
}
|
||
|
||
public func pageViewController(_ pageViewController: UIPageViewController, willTransitionTo pendingViewControllers: [UIViewController]) {
|
||
willTransitionToViewController = pendingViewControllers.first
|
||
}
|
||
|
||
}
|
||
|
||
extension RDReaderView: UICollectionViewDataSource, RDReaderFlowLayoutDelegate, RDReaderFlowLayoutDataSoure {
|
||
public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
|
||
|
||
|
||
if let identifer = self.dataSource?.pageIdentifier(readerView: self, pageNum: indexPath.row) {
|
||
|
||
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: identifer, for: IndexPath(item: indexPath.row, section: 0)) as! RDReaderContentCell
|
||
let conttainerView = self.dataSource?.pageContentView(readerView: self, pageNum: indexPath.row, containerView: cell.containerView)
|
||
if let conttainerView = conttainerView {
|
||
cell.containerView = conttainerView
|
||
}
|
||
// 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
|
||
}
|
||
|
||
public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
|
||
return self.dataSource?.pageCountOfReaderView(readerView: self) ?? 0
|
||
}
|
||
|
||
public func pageNum(flowLayout: RDReaderFlowLayout, pageIndex: Int) {
|
||
currentPage = pageIndex
|
||
|
||
}
|
||
|
||
public func heigtOfVerticalScrollPage(flowLayout: RDReaderFlowLayout, pageIndex: Int) -> CGFloat? {
|
||
return nil
|
||
}
|
||
}
|
||
|
||
extension RDReaderView {
|
||
public func register(contentView: UIView.Type, contentViewWithReuseIdentifier identifier: String) {
|
||
contentViews[identifier] = contentView
|
||
collectionView.register(RDReaderContentCell.self, forCellWithReuseIdentifier: identifier)
|
||
}
|
||
|
||
|
||
public func dequeueReusableContentView(withReuseIdentifier identifier: String, for pageNum: Int) -> UIView {
|
||
if self.currentDisplayType != .pageCurl, let cell = self.collectionView.cellForItem(at: IndexPath(row: pageNum, section: 0)) as? RDReaderContentCell, let containerView = cell.containerView {
|
||
return containerView
|
||
}
|
||
let contentViewClass = contentViews[identifier]
|
||
assert(contentViewClass != nil, "请调用register(contentView：contentViewWithReuseIdentifier：）")
|
||
var contentView = contentViewClass!.init()
|
||
return contentView
|
||
}
|
||
|
||
public func pageContentView(pageNum: Int) -> UIView? {
|
||
if currentDisplayType == .pageCurl {
|
||
return (self.pageViewController.viewControllers?.first as? RDReaderPageChildViewController)?.contentView
|
||
} else {
|
||
let cell = collectionView.cellForItem(at: IndexPath(item: pageNum, section: 0)) as? RDReaderContentCell
|
||
return cell?.containerView
|
||
}
|
||
}
|
||
}
|
||
|
||
private var cellViewKey: Int8 = 0
|
||
extension UIView {
|
||
var ss_superViewController: UIViewController? {
|
||
var next = self.next
|
||
while next != nil {
|
||
if next is UIViewController {
|
||
return next as? UIViewController
|
||
} else {
|
||
next = next!.next
|
||
}
|
||
}
|
||
return nil
|
||
}
|
||
|
||
}
|