public static NSFont ToNSFont(this FontStyle fontStyle, string fontFamilyName = "Verdana", int weight = 0, float?size = null)
{
if (!size.HasValue)
{
size = NSFont.LabelFontSize;
}
return(NSFontManager.SharedFontManager.FontWithFamily(
fontFamilyName,
fontStyle.ToNSFontTraitMask(),
weight,
size.Value
));
}