Add links in SwiftUI Text views via a custom string interpolation.

Text+Link.swift

import SwiftUI

extension LocalizedStringKey.StringInterpolation {
    /// String interpolation support for links in Text.
    ///
    /// Usage:
    ///
    ///     let url: URL = …
    ///     Text("\("Link title", url: url)")
    mutating func appendInterpolation(_ linkTitle: String, link url: URL) {
        var linkString = AttributedString(linkTitle)
        linkString.link = url
        self.appendInterpolation(linkString)
    }

    /// String interpolation support for links in Text.
    ///
    /// Usage:
    ///
    ///     Text("\("Link title", url: "https://example.com")")
    mutating func appendInterpolation(_ linkTitle: String, link urlString: String) {
        self.appendInterpolation(linkTitle, link: URL(string: urlString)!)
    }
}

// MARK: - Usage example

struct ContentView: View {
    var body: some View {
        VStack(spacing: 20) {
            // Link with custom string interpolation.
            Text("This is a \("custom string interpolation link", link: "https://example.com").")

            // Markdown works too.
            Text("This is a [Markdown link](https://example.com).")
        }
        .padding()
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}