Detect whether a font is bold/italic on iOS?

Question

Given a UIFont or a CTFont, how can I tell whether the font is bold/italic?

Answer 1

If you want to do this with Swift 2.0:

extension UIFont {
    var isBold: Bool {
        return fontDescriptor().symbolicTraits.contains(.TraitBold)
    }

    var isItalic: Bool {
        return fontDescriptor().symbolicTraits.contains(.TraitItalic)
    }
}

Usage:

let font: UIFont = UIFont.preferredFontForTextStyle(UIFontTextStyleHeadline)
if font.isBold {
  print("it's bold..")
}