How to remove the extra white space?

Hi,

My Code Snippet

myTextView.heightAnchor.constraint(greaterThanOrEqualToConstant: 20).isActive = true

let myHTMLString =" some html text"

myTextView.attributedText = myHTMLString.htmlToAttributedString

extension String {
    var htmlToAttributedString: NSAttributedString? {
        guard let data = data(using: .utf8) else { return NSAttributedString() }
        do {
            return try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding:String.Encoding.utf8.rawValue], documentAttributes: nil)
        } catch {
            return NSAttributedString()
        }
    }
    var htmlToString: String {
        return htmlToAttributedString?.string ?? ""
    }
}

HTMLString converted to attributed string.

But,

extra lines of white spaces exists in myTextView at the bottom.

What is the reason?

How to recitify it?

Thanks In Advance