How do you adjust text kerning using Interface Builder in Xcode 7?

Question

There are a myriad of settings for NSAttributedParagraphStyle that I can see in Interface Builder:

Answer 1

Swift 4 code:

@IBDesignable
extension UILabel {
@IBInspectable
public var kerning:CGFloat {
    set{
        if let currentAttibutedText = self.attributedText {
            let attribString = NSMutableAttributedString(attributedString: currentAttibutedText)
            attribString.addAttributes([NSAttributedStringKey.kern:newValue], range:NSMakeRange(0, currentAttibutedText.length))
            self.attributedText = attribString
        }
    } get {
        var kerning:CGFloat = 0
        if let attributedText = self.attributedText {
            attributedText.enumerateAttribute(NSAttributedStringKey.kern,
                                              in: NSMakeRange(0, attributedText.length),
                                              options: .init(rawValue: 0)) { (value, range, stop) in
                                                kerning = value as? CGFloat ?? 0
            }
        }
        return kerning
    }
}
}