53 lines
2.0 KiB
Swift
53 lines
2.0 KiB
Swift
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//
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// TextHighlightHelper.swift
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// Crush
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//
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// Created by Leon on 2025/1/15.
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//
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import UIKit
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/// 此方法：高亮部分是背景色不同，不是文字颜色
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class TextHighlightHelper {
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/// 为文本中的搜索关键词添加高亮样式
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/// - Parameters:
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/// - text: 原始文本
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/// - searchText: 搜索关键词
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/// - highlightColor: 高亮颜色
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/// - Returns: 带有高亮样式的NSAttributedString
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static func highlightText(_ text: String, searchText: String, highlightColor: UIColor = UIColor.c.cpvn) -> NSAttributedString {
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guard !searchText.isEmpty else {
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return NSAttributedString(string: text)
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}
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let attributedString = NSMutableAttributedString(string: text)
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let range = NSRange(location: 0, length: text.count)
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// 使用正则表达式进行不区分大小写的搜索
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do {
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let regex = try NSRegularExpression(pattern: NSRegularExpression.escapedPattern(for: searchText), options: .caseInsensitive)
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let matches = regex.matches(in: text, options: [], range: range)
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// 为匹配的文本添加高亮样式
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for match in matches {
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// backgroundColor
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attributedString.addAttribute(.foregroundColor, value: highlightColor, range: match.range)
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}
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} catch {
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// 如果正则表达式失败，使用简单的字符串搜索
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let lowercasedText = text.lowercased()
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let lowercasedSearchText = searchText.lowercased()
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var searchRange = lowercasedText.startIndex..<lowercasedText.endIndex
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while let range = lowercasedText.range(of: lowercasedSearchText, range: searchRange) {
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let nsRange = NSRange(range, in: text)
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attributedString.addAttribute(.backgroundColor, value: highlightColor, range: nsRange)
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searchRange = range.upperBound..<lowercasedText.endIndex
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}
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}
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return attributedString
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}
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}
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