83dfa40299
本次提交围绕搜索链路的稳定性、定位恢复体验以及长章节内存优化的验证能力进行了补强。 主要改动： 1. 调整阅读器搜索栏、搜索协调器与定位恢复逻辑，改善搜索结果跳转、状态同步与相关 UI 行为。 2. 补充内存探针接入点与上下文记录，便于跟踪阅读过程中的内存占用变化。 3. 更新 RDURLReaderController、ReaderContext 与工具视图相关实现，使调试与观测链路更完整。 4. 新增 MemoryFootprintTests，并同步更新 DemoReaderState 与 SearchTests，用 UI 测试覆盖搜索与内存相关回归场景。
635 lines
25 KiB
Swift
635 lines
25 KiB
Swift
import UIKit
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struct RDEPUBReaderSearchSection: Equatable {
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struct Item: Equatable {
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let matchIndex: Int
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let previewText: String
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let isCurrent: Bool
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}
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let title: String
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let items: [Item]
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}
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final class RDEPUBReaderSearchBarView: RDEPUBReaderToolView {
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var onSearchSubmit: ((String) -> Void)?
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var onSearchTextChanged: ((String) -> Void)?
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var onSearchPrevious: (() -> Void)?
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var onSearchNext: (() -> Void)?
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var onSelectMatch: ((Int) -> Void)?
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var onClose: (() -> Void)?
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let textField: UITextField = {
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let field = UITextField()
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field.placeholder = "搜索"
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field.font = UIFont.systemFont(ofSize: 18, weight: .medium)
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field.returnKeyType = .search
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field.autocorrectionType = .no
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field.autocapitalizationType = .none
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field.clearButtonMode = .whileEditing
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field.isAccessibilityElement = true
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if #available(iOS 13.0, *) {
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field.accessibilityTraits = .searchField
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}
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return field
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}()
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private let backgroundButton = UIButton(type: .custom)
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let panelView = UIView()
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private let grabberView = UIView()
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private let searchRowView = UIView()
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private let searchFieldContainer = UIView()
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private let searchIcon = UIImageView()
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private let searchFieldDivider = UIView()
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private let cancelButton = UIButton(type: .system)
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private let tableView = UITableView(frame: .zero, style: .plain)
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private let emptyStateLabel = UILabel()
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private let previousButton = RDEPUBReaderTintButton(type: .system)
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private let nextButton = RDEPUBReaderTintButton(type: .system)
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private let countLabel = UILabel()
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private var searchSections: [RDEPUBReaderSearchSection] = []
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private var keyword = ""
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private var currentMatchIndex: Int?
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override init(frame: CGRect) {
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super.init(frame: frame)
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accessibilityIdentifier = "epub.reader.search.bar"
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shouldGroupAccessibilityChildren = false
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isAccessibilityElement = false
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setupSubviews()
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setupConstraints()
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setupActions()
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updateLegacyNavigationEnabled(false)
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showInitialState()
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}
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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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override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
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// Only claim touches that fall within the panelView or the
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// accessibility-only navigation buttons. Taps on the dimmed scrim
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// area pass through to the reader content below, allowing chrome
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// toggle taps to work.
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let panelPoint = convert(point, to: panelView)
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if panelView.point(inside: panelPoint, with: event) {
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return super.hitTest(point, with: event)
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}
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// Also claim touches on the accessibility-only navigation buttons
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if previousButton.frame.contains(point)
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|| nextButton.frame.contains(point)
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|| countLabel.frame.contains(point) {
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return super.hitTest(point, with: event)
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}
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return nil
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}
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override func lineFrame(in bounds: CGRect) -> CGRect {
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.zero
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}
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override func apply(theme: RDEPUBReaderTheme) {
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super.apply(theme: theme)
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let isDarkBackground = theme.contentBackgroundColor.rd_isDarkBackground
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let overlayColor = isDarkBackground
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? UIColor(white: 0.12, alpha: 0.92)
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: UIColor(white: 0.08, alpha: 0.82)
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let panelColor = isDarkBackground
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? UIColor(red: 0.18, green: 0.18, blue: 0.19, alpha: 1)
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: UIColor(red: 0.15, green: 0.15, blue: 0.16, alpha: 1)
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let rowColor = isDarkBackground
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? UIColor(white: 0.18, alpha: 1)
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: UIColor(white: 0.14, alpha: 0.96)
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let cardColor = isDarkBackground
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? UIColor(white: 0.12, alpha: 1)
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: UIColor(white: 0.10, alpha: 0.98)
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let activeCardColor = UIColor(red: 0.17, green: 0.28, blue: 0.38, alpha: 1)
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let textColor = UIColor(white: 0.96, alpha: 1)
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let secondaryTextColor = UIColor(white: 0.72, alpha: 1)
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backgroundColor = .clear
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backgroundButton.backgroundColor = overlayColor
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panelView.backgroundColor = panelColor
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grabberView.backgroundColor = UIColor(white: 0.75, alpha: 0.7)
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searchRowView.backgroundColor = rowColor
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searchFieldContainer.backgroundColor = .clear
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searchFieldDivider.backgroundColor = UIColor(white: 1, alpha: 0.12)
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searchIcon.tintColor = secondaryTextColor
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cancelButton.tintColor = textColor
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cancelButton.setTitleColor(textColor, for: .normal)
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textField.textColor = textColor
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textField.tintColor = UIColor.systemBlue
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textField.keyboardAppearance = isDarkBackground ? .dark : .default
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textField.attributedPlaceholder = NSAttributedString(
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string: "搜索",
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attributes: [.foregroundColor: secondaryTextColor]
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)
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emptyStateLabel.textColor = secondaryTextColor
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tableView.backgroundColor = .clear
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tableView.separatorStyle = .none
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previousButton.tintColor = textColor
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nextButton.tintColor = textColor
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countLabel.textColor = textColor
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countLabel.backgroundColor = .clear
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RDEPUBReaderSearchResultCell.cardBackgroundColor = cardColor
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RDEPUBReaderSearchResultCell.activeCardBackgroundColor = activeCardColor
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RDEPUBReaderSearchResultCell.primaryTextColor = textColor
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RDEPUBReaderSearchResultCell.highlightTextColor = UIColor.systemBlue
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RDEPUBReaderSearchResultCell.activeHighlightTextColor = UIColor(red: 0.40, green: 0.77, blue: 1, alpha: 1)
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tableView.reloadData()
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}
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var presentedView: UIView {
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panelView
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}
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func updateMatchCount(current: Int, total: Int) {
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countLabel.text = "\(current)/\(total)"
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textField.accessibilityValue = "\(current)/\(total)"
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updateLegacyNavigationEnabled(total > 0)
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}
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func showNoResults() {
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currentMatchIndex = nil
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updateMatchCount(current: 0, total: 0)
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tableView.isHidden = true
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emptyStateLabel.isHidden = false
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emptyStateLabel.text = keyword.isEmpty ? "输入关键词开始搜索" : "未找到相关内容"
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}
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func showSearching() {
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updateMatchCount(current: 0, total: 0)
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tableView.isHidden = true
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emptyStateLabel.isHidden = false
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emptyStateLabel.text = "搜索中..."
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}
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func restoreKeyword(_ keyword: String) {
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textField.text = keyword
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self.keyword = keyword
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}
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func updateResults(
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sections: [RDEPUBReaderSearchSection],
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keyword: String,
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currentMatchIndex: Int?
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) {
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self.keyword = keyword
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self.searchSections = sections
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self.currentMatchIndex = currentMatchIndex
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let total = sections.reduce(0) { $0 + $1.items.count }
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if let currentMatchIndex, total > 0 {
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updateMatchCount(current: currentMatchIndex + 1, total: total)
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} else {
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updateMatchCount(current: 0, total: total)
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}
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if total == 0 {
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showNoResults()
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return
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}
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emptyStateLabel.isHidden = true
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tableView.isHidden = false
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tableView.reloadData()
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scrollToCurrentMatchIfNeeded()
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}
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private func setupSubviews() {
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backgroundButton.translatesAutoresizingMaskIntoConstraints = false
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panelView.translatesAutoresizingMaskIntoConstraints = false
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grabberView.translatesAutoresizingMaskIntoConstraints = false
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searchRowView.translatesAutoresizingMaskIntoConstraints = false
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searchFieldContainer.translatesAutoresizingMaskIntoConstraints = false
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searchIcon.translatesAutoresizingMaskIntoConstraints = false
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textField.translatesAutoresizingMaskIntoConstraints = false
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searchFieldDivider.translatesAutoresizingMaskIntoConstraints = false
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cancelButton.translatesAutoresizingMaskIntoConstraints = false
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tableView.translatesAutoresizingMaskIntoConstraints = false
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emptyStateLabel.translatesAutoresizingMaskIntoConstraints = false
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previousButton.translatesAutoresizingMaskIntoConstraints = false
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nextButton.translatesAutoresizingMaskIntoConstraints = false
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countLabel.translatesAutoresizingMaskIntoConstraints = false
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addSubview(backgroundButton)
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addSubview(panelView)
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panelView.addSubview(grabberView)
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panelView.addSubview(searchRowView)
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panelView.addSubview(tableView)
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panelView.addSubview(emptyStateLabel)
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searchRowView.addSubview(searchFieldContainer)
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searchRowView.addSubview(searchFieldDivider)
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searchRowView.addSubview(cancelButton)
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searchFieldContainer.addSubview(searchIcon)
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searchFieldContainer.addSubview(textField)
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addSubview(previousButton)
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addSubview(nextButton)
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addSubview(countLabel)
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if #available(iOS 13.0, *) {
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searchIcon.image = UIImage(systemName: "magnifyingglass")
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previousButton.setImage(UIImage(systemName: "chevron.up"), for: .normal)
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nextButton.setImage(UIImage(systemName: "chevron.down"), for: .normal)
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} else {
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previousButton.setTitle("▲", for: .normal)
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nextButton.setTitle("▼", for: .normal)
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}
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searchIcon.contentMode = .scaleAspectFit
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searchIcon.preferredSymbolConfiguration = UIImage.SymbolConfiguration(pointSize: 22, weight: .regular)
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panelView.layer.cornerRadius = 28
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panelView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
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panelView.clipsToBounds = true
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grabberView.layer.cornerRadius = 3
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searchRowView.layer.cornerRadius = 22
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searchFieldContainer.layer.cornerRadius = 22
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searchRowView.clipsToBounds = true
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cancelButton.setTitle("取消", for: .normal)
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cancelButton.titleLabel?.font = UIFont.systemFont(ofSize: 18, weight: .medium)
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cancelButton.accessibilityIdentifier = "epub.reader.search.close"
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emptyStateLabel.font = UIFont.systemFont(ofSize: 17, weight: .medium)
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emptyStateLabel.textAlignment = .center
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emptyStateLabel.numberOfLines = 0
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previousButton.accessibilityIdentifier = "epub.reader.search.previous"
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nextButton.accessibilityIdentifier = "epub.reader.search.next"
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countLabel.accessibilityIdentifier = "epub.reader.search.count"
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textField.accessibilityIdentifier = "epub.reader.search.field"
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// 0.02 而非 0.01：CALayer.opacity 为 Float32，0.01 落盘后略小于
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// 0.01，会被 UIKit 命中测试按「透明视图」剔除，导致按钮永远点不中。
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previousButton.alpha = 0.02
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nextButton.alpha = 0.02
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countLabel.alpha = 0.02
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tableView.register(RDEPUBReaderSearchResultCell.self, forCellReuseIdentifier: RDEPUBReaderSearchResultCell.reuseIdentifier)
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tableView.dataSource = self
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tableView.delegate = self
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tableView.showsVerticalScrollIndicator = false
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tableView.contentInset = UIEdgeInsets(top: 4, left: 0, bottom: 16, right: 0)
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}
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private func setupConstraints() {
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NSLayoutConstraint.activate([
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backgroundButton.leadingAnchor.constraint(equalTo: leadingAnchor),
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backgroundButton.trailingAnchor.constraint(equalTo: trailingAnchor),
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backgroundButton.topAnchor.constraint(equalTo: topAnchor),
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backgroundButton.bottomAnchor.constraint(equalTo: bottomAnchor),
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panelView.leadingAnchor.constraint(equalTo: leadingAnchor),
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panelView.trailingAnchor.constraint(equalTo: trailingAnchor),
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panelView.topAnchor.constraint(equalTo: safeAreaLayoutGuide.topAnchor, constant: 8),
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panelView.bottomAnchor.constraint(equalTo: bottomAnchor),
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grabberView.topAnchor.constraint(equalTo: panelView.topAnchor, constant: 10),
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grabberView.centerXAnchor.constraint(equalTo: panelView.centerXAnchor),
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grabberView.widthAnchor.constraint(equalToConstant: 92),
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grabberView.heightAnchor.constraint(equalToConstant: 6),
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searchRowView.leadingAnchor.constraint(equalTo: panelView.leadingAnchor, constant: 20),
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searchRowView.trailingAnchor.constraint(equalTo: panelView.trailingAnchor, constant: -20),
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searchRowView.topAnchor.constraint(equalTo: grabberView.bottomAnchor, constant: 18),
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searchRowView.heightAnchor.constraint(equalToConstant: 52),
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searchFieldContainer.leadingAnchor.constraint(equalTo: searchRowView.leadingAnchor, constant: 12),
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searchFieldContainer.topAnchor.constraint(equalTo: searchRowView.topAnchor),
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searchFieldContainer.bottomAnchor.constraint(equalTo: searchRowView.bottomAnchor),
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searchIcon.leadingAnchor.constraint(equalTo: searchFieldContainer.leadingAnchor, constant: 10),
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searchIcon.centerYAnchor.constraint(equalTo: searchFieldContainer.centerYAnchor),
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searchIcon.widthAnchor.constraint(equalToConstant: 24),
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searchIcon.heightAnchor.constraint(equalToConstant: 24),
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textField.leadingAnchor.constraint(equalTo: searchIcon.trailingAnchor, constant: 10),
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textField.trailingAnchor.constraint(equalTo: searchFieldContainer.trailingAnchor, constant: -10),
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textField.topAnchor.constraint(equalTo: searchFieldContainer.topAnchor),
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textField.bottomAnchor.constraint(equalTo: searchFieldContainer.bottomAnchor),
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searchFieldDivider.leadingAnchor.constraint(equalTo: searchFieldContainer.trailingAnchor, constant: 12),
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searchFieldDivider.centerYAnchor.constraint(equalTo: searchRowView.centerYAnchor),
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searchFieldDivider.widthAnchor.constraint(equalToConstant: 1),
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searchFieldDivider.heightAnchor.constraint(equalToConstant: 28),
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cancelButton.leadingAnchor.constraint(equalTo: searchFieldDivider.trailingAnchor, constant: 18),
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cancelButton.trailingAnchor.constraint(equalTo: searchRowView.trailingAnchor, constant: -18),
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cancelButton.centerYAnchor.constraint(equalTo: searchRowView.centerYAnchor),
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tableView.leadingAnchor.constraint(equalTo: panelView.leadingAnchor, constant: 0),
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tableView.trailingAnchor.constraint(equalTo: panelView.trailingAnchor, constant: 0),
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tableView.topAnchor.constraint(equalTo: searchRowView.bottomAnchor, constant: 18),
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tableView.bottomAnchor.constraint(equalTo: panelView.safeAreaLayoutGuide.bottomAnchor),
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emptyStateLabel.leadingAnchor.constraint(equalTo: panelView.leadingAnchor, constant: 32),
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emptyStateLabel.trailingAnchor.constraint(equalTo: panelView.trailingAnchor, constant: -32),
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emptyStateLabel.topAnchor.constraint(equalTo: searchRowView.bottomAnchor, constant: 56),
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// 无障碍/UI 测试专用的隐形控件：必须放在 panel 顶部而非视图
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// 左上角——视图左上角落在系统状态栏区域内，合成点击会被状态栏
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// 窗口拦截，永远到不了这些按钮。
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previousButton.topAnchor.constraint(equalTo: panelView.topAnchor),
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previousButton.leadingAnchor.constraint(equalTo: leadingAnchor),
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previousButton.widthAnchor.constraint(equalToConstant: 1),
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previousButton.heightAnchor.constraint(equalToConstant: 1),
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nextButton.topAnchor.constraint(equalTo: panelView.topAnchor),
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nextButton.leadingAnchor.constraint(equalTo: previousButton.trailingAnchor),
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nextButton.widthAnchor.constraint(equalToConstant: 1),
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nextButton.heightAnchor.constraint(equalToConstant: 1),
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countLabel.topAnchor.constraint(equalTo: panelView.topAnchor),
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countLabel.leadingAnchor.constraint(equalTo: nextButton.trailingAnchor),
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countLabel.widthAnchor.constraint(equalToConstant: 1),
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countLabel.heightAnchor.constraint(equalToConstant: 1)
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])
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}
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private func setupActions() {
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textField.delegate = self
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textField.addTarget(self, action: #selector(textFieldDidReturn), for: .editingDidEndOnExit)
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textField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
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previousButton.addTarget(self, action: #selector(previousAction), for: .touchUpInside)
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nextButton.addTarget(self, action: #selector(nextAction), for: .touchUpInside)
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cancelButton.addTarget(self, action: #selector(closeAction), for: .touchUpInside)
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backgroundButton.addTarget(self, action: #selector(closeAction), for: .touchUpInside)
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}
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private func updateLegacyNavigationEnabled(_ enabled: Bool) {
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previousButton.isEnabled = enabled
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nextButton.isEnabled = enabled
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}
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private func showInitialState() {
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tableView.isHidden = true
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emptyStateLabel.isHidden = false
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emptyStateLabel.text = "输入关键词开始搜索"
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}
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private func scrollToCurrentMatchIfNeeded() {
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guard let currentMatchIndex else { return }
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for (sectionIndex, section) in searchSections.enumerated() {
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if let rowIndex = section.items.firstIndex(where: { $0.matchIndex == currentMatchIndex }) {
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let indexPath = IndexPath(row: rowIndex, section: sectionIndex)
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DispatchQueue.main.async { [weak self] in
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self?.tableView.scrollToRow(at: indexPath, at: .middle, animated: false)
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}
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return
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}
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}
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}
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private func item(at indexPath: IndexPath) -> RDEPUBReaderSearchSection.Item {
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searchSections[indexPath.section].items[indexPath.row]
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}
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@objc private func textFieldDidReturn() {
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let keyword = textField.text?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
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guard !keyword.isEmpty else { return }
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onSearchSubmit?(keyword)
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textField.resignFirstResponder()
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}
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@objc private func textFieldDidChange() {
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guard textField.markedTextRange == nil else { return }
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onSearchTextChanged?(textField.text ?? "")
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}
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@objc private func previousAction() {
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onSearchPrevious?()
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}
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@objc private func nextAction() {
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onSearchNext?()
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}
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@objc private func closeAction() {
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onClose?()
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}
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}
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extension RDEPUBReaderSearchBarView: UITableViewDataSource, UITableViewDelegate {
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func numberOfSections(in tableView: UITableView) -> Int {
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searchSections.count
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}
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func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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searchSections[section].items.count
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}
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func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
|
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let cell = tableView.dequeueReusableCell(
|
||
withIdentifier: RDEPUBReaderSearchResultCell.reuseIdentifier,
|
||
for: indexPath
|
||
)
|
||
|
||
guard let cell = cell as? RDEPUBReaderSearchResultCell else {
|
||
return cell
|
||
}
|
||
|
||
let item = item(at: indexPath)
|
||
cell.configure(
|
||
previewText: item.previewText,
|
||
keyword: keyword,
|
||
isCurrent: item.isCurrent
|
||
)
|
||
cell.accessibilityIdentifier = "epub.reader.search.result.\(item.matchIndex)"
|
||
return cell
|
||
}
|
||
|
||
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
|
||
let container = UIView()
|
||
let label = UILabel()
|
||
label.translatesAutoresizingMaskIntoConstraints = false
|
||
label.font = UIFont.systemFont(ofSize: 19, weight: .bold)
|
||
label.textColor = UIColor(white: 0.96, alpha: 1)
|
||
label.text = searchSections[section].title
|
||
label.numberOfLines = 2
|
||
container.addSubview(label)
|
||
|
||
NSLayoutConstraint.activate([
|
||
label.leadingAnchor.constraint(equalTo: container.leadingAnchor, constant: 20),
|
||
label.trailingAnchor.constraint(equalTo: container.trailingAnchor, constant: -20),
|
||
label.topAnchor.constraint(equalTo: container.topAnchor, constant: 4),
|
||
label.bottomAnchor.constraint(equalTo: container.bottomAnchor, constant: -4)
|
||
])
|
||
return container
|
||
}
|
||
|
||
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
|
||
40
|
||
}
|
||
|
||
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
|
||
UITableView.automaticDimension
|
||
}
|
||
|
||
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
|
||
116
|
||
}
|
||
|
||
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
|
||
tableView.deselectRow(at: indexPath, animated: true)
|
||
onSelectMatch?(item(at: indexPath).matchIndex)
|
||
}
|
||
}
|
||
|
||
extension RDEPUBReaderSearchBarView: UITextFieldDelegate {
|
||
|
||
func textFieldShouldClear(_ textField: UITextField) -> Bool {
|
||
DispatchQueue.main.async { [weak self] in
|
||
self?.onSearchTextChanged?("")
|
||
}
|
||
return true
|
||
}
|
||
}
|
||
|
||
private final class RDEPUBReaderSearchResultCell: UITableViewCell {
|
||
|
||
static let reuseIdentifier = "RDEPUBReaderSearchResultCell"
|
||
|
||
static var cardBackgroundColor = UIColor(white: 0.12, alpha: 1)
|
||
|
||
static var activeCardBackgroundColor = UIColor(red: 0.17, green: 0.28, blue: 0.38, alpha: 1)
|
||
|
||
static var primaryTextColor = UIColor(white: 0.96, alpha: 1)
|
||
|
||
static var highlightTextColor = UIColor.systemBlue
|
||
|
||
static var activeHighlightTextColor = UIColor(red: 0.40, green: 0.77, blue: 1, alpha: 1)
|
||
|
||
private let cardView = UIView()
|
||
|
||
private let previewLabel = UILabel()
|
||
|
||
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
|
||
super.init(style: style, reuseIdentifier: reuseIdentifier)
|
||
setupSubviews()
|
||
setupConstraints()
|
||
}
|
||
|
||
required init?(coder: NSCoder) {
|
||
fatalError("init(coder:) has not been implemented")
|
||
}
|
||
|
||
override func prepareForReuse() {
|
||
super.prepareForReuse()
|
||
previewLabel.attributedText = nil
|
||
}
|
||
|
||
func configure(previewText: String, keyword: String, isCurrent: Bool) {
|
||
selectionStyle = .none
|
||
backgroundColor = .clear
|
||
contentView.backgroundColor = .clear
|
||
cardView.backgroundColor = isCurrent ? Self.activeCardBackgroundColor : Self.cardBackgroundColor
|
||
previewLabel.attributedText = attributedPreviewText(
|
||
previewText,
|
||
keyword: keyword,
|
||
isCurrent: isCurrent
|
||
)
|
||
}
|
||
|
||
private func setupSubviews() {
|
||
cardView.translatesAutoresizingMaskIntoConstraints = false
|
||
previewLabel.translatesAutoresizingMaskIntoConstraints = false
|
||
|
||
contentView.addSubview(cardView)
|
||
cardView.addSubview(previewLabel)
|
||
|
||
cardView.layer.cornerRadius = 16
|
||
cardView.clipsToBounds = true
|
||
|
||
previewLabel.numberOfLines = 0
|
||
previewLabel.font = UIFont.systemFont(ofSize: 18, weight: .regular)
|
||
}
|
||
|
||
private func setupConstraints() {
|
||
NSLayoutConstraint.activate([
|
||
cardView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 20),
|
||
cardView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -20),
|
||
cardView.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 10),
|
||
cardView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -10),
|
||
|
||
previewLabel.leadingAnchor.constraint(equalTo: cardView.leadingAnchor, constant: 16),
|
||
previewLabel.trailingAnchor.constraint(equalTo: cardView.trailingAnchor, constant: -16),
|
||
previewLabel.topAnchor.constraint(equalTo: cardView.topAnchor, constant: 16),
|
||
previewLabel.bottomAnchor.constraint(equalTo: cardView.bottomAnchor, constant: -16)
|
||
])
|
||
}
|
||
|
||
private func attributedPreviewText(_ previewText: String, keyword: String, isCurrent: Bool) -> NSAttributedString {
|
||
let normalizedText = previewText
|
||
.replacingOccurrences(of: "\n", with: " ")
|
||
.replacingOccurrences(of: "\\s+", with: " ", options: .regularExpression)
|
||
.trimmingCharacters(in: .whitespacesAndNewlines)
|
||
|
||
let paragraphStyle = NSMutableParagraphStyle()
|
||
paragraphStyle.lineSpacing = 8
|
||
|
||
let attributed = NSMutableAttributedString(
|
||
string: normalizedText,
|
||
attributes: [
|
||
.font: UIFont.systemFont(ofSize: 18, weight: .regular),
|
||
.foregroundColor: Self.primaryTextColor,
|
||
.paragraphStyle: paragraphStyle
|
||
]
|
||
)
|
||
|
||
let searchKeyword = keyword.trimmingCharacters(in: .whitespacesAndNewlines)
|
||
guard !searchKeyword.isEmpty else { return attributed }
|
||
|
||
let nsText = normalizedText as NSString
|
||
var searchRange = NSRange(location: 0, length: nsText.length)
|
||
let highlightColor = isCurrent ? Self.activeHighlightTextColor : Self.highlightTextColor
|
||
|
||
while searchRange.length > 0 {
|
||
let foundRange = nsText.range(of: searchKeyword, options: [.caseInsensitive], range: searchRange)
|
||
guard foundRange.location != NSNotFound else { break }
|
||
attributed.addAttribute(.foregroundColor, value: highlightColor, range: foundRange)
|
||
let nextLocation = foundRange.location + max(foundRange.length, 1)
|
||
guard nextLocation < nsText.length else { break }
|
||
searchRange = NSRange(location: nextLocation, length: nsText.length - nextLocation)
|
||
}
|
||
|
||
return attributed
|
||
}
|
||
}
|