swift storyboard 跳转的2 种方式

let personalViewController = GET_SB("Personal").instantiateViewControllerWithIdentifier("PersonalNavigationController")
self.presentViewController(personalViewController, animated: true, completion: nil)

let personalViewController = GET_SB("Personal").instantiateViewControllerWithIdentifier("PersonalNavigationController")
self.presentViewController(personalViewController, animated: true, completion: nil)

func GET_SB (sbName : String) -> UIStoryboard {
return UIStoryboard(name: sbName, bundle: NSBundle.mainBundle())
}