Enable dynamic font with custom weight

UIFont.swift

extension UIFont {

    @available(iOS 11.0, *)
    static func preferredFont(for style: TextStyle, weight: Weight) -> UIFont {
        let metrics = UIFontMetrics(forTextStyle: style)
        let desc = UIFontDescriptor.preferredFontDescriptor(withTextStyle: style)
        let font = UIFont.systemFont(ofSize: desc.pointSize, weight: weight)
      
        return metrics.scaledFont(for: font)
    }

}