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

And if you are looking for the swift implementation:

let normalFont = UIFont(name: "FONT_NAME", size: CGFloat(20))!
let boldFont = UIFont(descriptor: normalFont.fontDescriptor.withSymbolicTraits(.traitBold)!, size: normalFont.pointSize)

Hope this helps! Cheers!