48 lines
1.7 KiB
Swift
48 lines
1.7 KiB
Swift
/*
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UICodeHighlightingLabel.swift
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pass
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Created by Danny Moesch on 20.01.19.
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Copyright © 2019 Bob Sun. All rights reserved.
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*/
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import UIKit
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import passKit
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class UICodeHighlightingLabel: UILocalizedLabel {
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private static let CODE_ATTRIBUTES: [NSAttributedString.Key: Any] = [.font: UIFont(name: "Menlo-Regular", size: 12)!]
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private static let ATTRIBUTED_NEWLINE = NSAttributedString(string: "\n")
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override func awakeFromNib() {
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super.awakeFromNib()
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guard let text = text else {
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return
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}
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attributedText = formatCode(in: text)
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}
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/// Format code sections in a multiline string block.
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///
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/// A line in the string is interpreted as a code section if it starts with two spaces.
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///
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/// - Parameter text: Multiline string block
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/// - Returns: Same multiline string block with code sections formatted
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private func formatCode(in text: String) -> NSMutableAttributedString {
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let formattedText = text
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.split(omittingEmptySubsequences: false) {
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$0 == "\n" || $0 == "\r\n"
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}.map { line -> NSAttributedString in
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if line.starts(with: " ") {
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return NSAttributedString(string: String(line), attributes: UICodeHighlightingLabel.CODE_ATTRIBUTES)
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}
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return NSAttributedString(string: String(line))
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}.reduce(into: NSMutableAttributedString(string: "")) {
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$0.append($1)
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$0.append(UICodeHighlightingLabel.ATTRIBUTED_NEWLINE)
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}
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formattedText.deleteCharacters(in: NSRange(location: formattedText.length - 1, length: 1))
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return formattedText
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}
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}
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