UIFont extensions to be able to get bold and bold italic fonts directlky from a UIFont object

UIFont+.swift

/**
 UIFont extensions to be able to get bold and bold italic fonts directlky
 from a UIFont object
 */
import Foundation
import UIKit

extension UIFont {
    
    func withTraits(traits:UIFontDescriptorSymbolicTraits...) -> UIFont {
        let descriptor = self.fontDescriptor()
            .fontDescriptorWithSymbolicTraits(UIFontDescriptorSymbolicTraits(traits))
        return UIFont(descriptor: descriptor, size: 0)
    }
    
    func boldItalic() -> UIFont {
        return withTraits(.TraitBold, .TraitCondensed)
    }
    
    func bold() -> UIFont {
        return withTraits(.TraitBold)
    }
}