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I am using Xcode 5 in a newly created app and when I just create it I go for the run button e click on it, then the project gets built but it does not show in the iOS Simulator and I get the following message:

 Failed to instantiate the default view controller for UIMainStoryboardFile 'Main' - 
 perhaps the designated entry point is not set?

I've Googled about it of course and everybody points out that this is happening because …

我想在app delegate中设置rootViewController ..

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {

     var rootView: MyRootViewController = MyRootViewController()
     //Code to set this viewController as the root view??


     return true

}