How do I create a bold UIFont from a regular UIFont?

Question

If I have a UIFont object, is it possible to convert it to bold? I don\'t know the font name, I just have a UIFont object. What I want is a function like

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Answer 1

Since this question pops up when you search for bold UIFonts in Swift, here's a fresh answer:

extension UIFont {
    /// Returns a new font in the same family with the given symbolic traits,
    /// or `nil` if none found in the system.
    func withSymbolicTraits(_ traits: UIFontDescriptor.SymbolicTraits) -> UIFont? {
        guard let descriptorWithTraits = fontDescriptor.withSymbolicTraits(traits)
            else { return nil }
        return UIFont(descriptor: descriptorWithTraits, size: 0)
    }
}

Example:

myFont.withSymbolicTraits(.taitBold) // returns the bold version of myFont