Swifty Hackies

1. Navigation Bar 上的 titleLabel
   if let navTitleLabel = navigationController?.navigationBar.subviews.filter({ v in
   let cls: AnyClass = NSClassFromString("UINavigationItemView")!
   return v.dynamicType == cls.self
   }).first?.subviews.first as? UILabel {
   print(navTitleLabel)
   }