bounding_rect_font_leading.swift

import UIKit

let text = "Saw yet kindness too replying whatever marianne. Old sentiments resolution admiration unaffected its mrs literature. (https://www.google.com/), Situation admitting promotion at or to perceived be. Mr acuteness we as estimable enjoyment up. An held late as felt know."

let font = UIFont.preferredFont(forTextStyle: .body)
let highlightFont = UIFont.preferredFont(forTextStyle: .headline)

let attributedText = NSMutableAttributedString(string: text, attributes: [
    .font : font
])

attributedText.addAttributes([
    .font: highlightFont,
    .foregroundColor: UIColor.systemBlue,
    .underlineStyle: NSUnderlineStyle.single.rawValue
], range: NSRange(location: 118, length: 23))

let constraintSize = CGSize(width: 250, height: CGFloat.greatestFiniteMagnitude)

let height_with_font_leading = attributedText.boundingRect(with: constraintSize,
                                                           options: [.usesLineFragmentOrigin, .usesFontLeading],
                                                           context: nil).height

let height_with_no_font_leading = attributedText.boundingRect(with: constraintSize,
                                                              options: [.usesLineFragmentOrigin],
                                                              context: nil).height


// "202.87109375"
print(height_with_font_leading)

// "218.287109375"
print(height_with_no_font_leading)