May 7, 2015 Swiftに慣れてくると!を避けたくなりますが、!を書きたくなるようなケースもあります。 func loadSignInViewController() -> SignInViewController { let storyboard = UIStoryboard(name: "SignIn", bundle: nil) let viewController = storyboard.instantiateInitialViewController() as! SignInViewController return viewController } func loadSignInViewController() -> SignInViewController { let storyboard = UIStoryboard(name: "SignIn", bundle