CGSizeAspect.swift

extension CGSize {
  enum Aspect {
    case portrait, landscape, square
  }  
  var aspect: Aspect {
    switch width / height {
    case 1.0:
      return .square
    case 1.0...:
      return .landscape
    default:
      return .portrait
    }
  }  
  var aspectRatio: CGFloat {
    return width / height
  }
}