How to change hyper link text color in SwiftUI-CodePudding

I am trying to custom change the default font color of hyperlink in a given markdown string with SwiftUI. Something equivalent to txtString.linkTextAttributes = [ .foregroundColor: UIColor.red ] of UIKit. Here's my code:


import SwiftUI

struct TextViewAttributedString: View {
    var markdownString: String
    var body: some View {
        Text(convertIntoAttributedString(markdownString:markdownString))
    }
    
    private func convertIntoAttributedString(markdownString: String) -> AttributedString {
        guard var attributedString = try? AttributedString(
            markdown: markdownString,
            options: AttributedString.MarkdownParsingOptions(allowsExtendedAttributes: true,
                                                             interpretedSyntax: .inlineOnlyPreservingWhitespace))
        else {
            return AttributedString(markdownString)
        }
        attributedString.font = .custom("Times New Roman", size: 16, relativeTo: .body)
        
        let runs = attributedString.runs
        for run in runs {
            let range = run.range
            if let textStyle = run .inlinePresentationIntent {
                if textStyle.contains(.stronglyEmphasized) { // .stronglyEmphasized is available
                    // change foreground color of bold text
                    attributedString[range].foregroundColor = .green
                }
                if textStyle.contains(.linkTextAttributes) { // compiler error since .linkTextAttributes not available
                    // change color here but .linkTextAttributes is not available in inlinePresentationIntent
                    // Any other way to change the hyperlink color?
                }
            }
        }
        return attributedString
    }
}

Example View where AttribtedString being used

import SwiftUI

struct AttributedStringView: View {
    let text: String = "**Bold** regular and _italic_ \nnewline\n[hyperlink](www.google.com)"
    var body: some View {
        TextViewAttributedString(markdownString: text)
    }
}

struct AttributedStringView_Previews: PreviewProvider {
    static var previews: some View {
        AttributedStringView()
    }
}

Result: Result Screen

Reference Docs: https://developer.apple.com/documentation/foundation/attributedstring https://developer.apple.com/videos/play/wwdc2021/10109/

CodePudding user response：

        if run.link != nil {
            // change foreground color of link
            attributedString[range].foregroundColor = .orange
        }

CodePudding user response：

iOS 15: You can initialize SwiftUIs Text with an AttributedString. You can create the AttributedString from a markdown string, find the link labels with regex and change the color for that part of the AttributedString.

let markdown = "**Bold** regular and _italic_ [hyperlink cool](www.google.com)"
let linkColor = UIColor.green

var body: some View {
    Text(makeAttributedString())
}

func makeAttributedString() -> AttributedString {
    var string = (try? AttributedString(markdown: markdown)) ?? AttributedString("Error markdown")
    let linkLabels = getLinkLabels(markdownString: markdown)
    for label in linkLabels {
        if let range = string.range(of: label) {
            string[range].foregroundColor = linkColor
        }
    }
    return string
}

func getLinkLabels(markdownString: String) -> [String] {
    guard let regex = try? NSRegularExpression(pattern: "\\[[a-zA-Z0-9_ ]*\\]") else { return [] }
    let results = regex.matches(in: markdownString,
                                range: NSRange(markdownString.startIndex..., in: markdownString))
    let labels = results.compactMap {
        Range($0.range, in: markdownString).map { String(markdownString[$0]) }
    }
    // removing the brackets from the link labels before return
    return labels.map { $0.trimmingCharacters(in: CharacterSet(charactersIn: "[]")) }
}