How to use UIView.recursiveDescription in a Swift playground

SwiftRecursiveDescription.swift

let v = UIView()
// use `performSelector` to workaround that the method is private
// use `takeRetainedValue` to get an AnyObject
// use the forced cast because we know it's a string
let s = v.performSelector("recursiveDescription").takeRetainedValue() as! String
// convert the string to a fixed width font, so the quicklook is useful
NSAttributedString(string: s, attributes: [UIFontDescriptorFeatureSettingsAttribute:[UIFontFeatureTypeIdentifierKey:kMonospacedTextSelector]])