UITextView extension for clickable hyperlink.

UITextView_Extension.swift

extension UITextView {
    func hyperLink(originalText: String,
                   hyperLink: String,
                   urlString: String,
                   withFont font: UIFont = UIFont.systemFont(ofSize: 16.0),
                   textColor: UIColor = .black,
                   linkColor: UIColor = .blue) {
        isEditable = false

        let style = NSMutableParagraphStyle()
        style.alignment = .left

        let attributedOriginalText = NSMutableAttributedString(string: originalText)
        let linkRange = attributedOriginalText.mutableString.range(of: hyperLink)
        let fullRange = NSMakeRange(0, attributedOriginalText.length)
        attributedOriginalText.addAttribute(NSAttributedString.Key.link, value: urlString, range: linkRange)
        attributedOriginalText.addAttribute(NSAttributedString.Key.paragraphStyle, value: style, range: fullRange)
        attributedOriginalText.addAttribute(NSAttributedString.Key.foregroundColor, value: textColor, range: fullRange)
        attributedOriginalText.addAttribute(NSAttributedString.Key.font, value: font, range: fullRange)

        self.linkTextAttributes = [
            NSAttributedString.Key.foregroundColor.rawValue: linkColor,
            NSAttributedString.Key.underlineStyle: NSUnderlineStyle.styleSingle.rawValue,
            ] as? [String: Any]

        self.attributedText = attributedOriginalText
    }
}