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

Attempting to derive the bold/italic font using font or family names no longer works correctly since iOS 7, due to the cryptic font family name of the system font. Below is a simple extension to derive the bold/italic font using the UIFontDescriptor class.

+(UIFont *) font:(UIFont *)font bold:(BOOL)bold italic:(BOOL)italic
{
    NSUInteger traits = 0;
    if (bold)
    {
        traits |= UIFontDescriptorTraitBold;
    }
    if (italic)
    {
        traits |= UIFontDescriptorTraitItalic;
    }
    return [UIFont fontWithDescriptor:[[font fontDescriptor] fontDescriptorWithSymbolicTraits:traits] size:font.pointSize];
}