highlight.swift

extension String {
    func add(highlight: String, color: UIColor = .white) -> NSAttributedString {
        let attributedString = NSMutableAttributedString(string: self)
        guard
            let range = self.range(of: highlight),
            let fullRange = self.range(of: self)
        else {
            return attributedString
        }
        
        let nsFullRange = NSMakeRange(fullRange.lowerBound.utf16Offset(in: self), self.count)
        attributedString.addAttributes([.foregroundColor: color],
                                       range: nsFullRange)
        let nsRange = NSMakeRange(range.lowerBound.utf16Offset(in: self), highlight.count)
        attributedString.addAttributes([.foregroundColor: color,
                                        .underlineColor: color,
                                        .link: "https://www.google.com",
                                        .underlineStyle: NSUnderlineStyle.single.rawValue],
                                       range: nsRange)
        
        return attributedString
    }
}