How to change hyper link text color in SwiftUI - swift

Question

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/

Answer 1

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

Answer 2

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: "[]")) }
}

Answer 3

I had to replace the AttributeContainer.
if run.link != nil {
var container = AttributeContainer()
container.foregroundColor = .red
attributedString[range].setAttributes(container)
}

Answer 4

The easiest solution for me was:
Text(.init("some text **[google.com](https://google.com)**"))
.accentColor(.red)