■UIStoryboard

プロパティメソッド

//どのUIstoryboardなのか？
init(name: String, bundle storyboardBundleOrNil: Bundle?)

//例 Mainって言うUIStoryboardやで
let storyboard = UIStoryboard(name: "Main", bundle: nil)

//どのUIviewContorollerなのか？
open func instantiateViewController(withIdentifier identifier: String)

//例: Main.storyboardのStoryboardID:CodeってつけたUIViewControllerやで
let CodeView = storyboard.instantiateViewController(withIdentifier: "Code")

//どのUIviewContorollerなのか？
   open func instantiateInitialViewController() -> UIViewController?

//例: MainStoryboardのFirstViewControllerやで
   let CodeView = storyboard.instantiateViewController() as! FirstViewController

■縮めてまとめて書く

 UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController() as! FirstViewController