如何将initialViewController放在AppDelegate的代码中？迅速

Question

在我的故事板中，我没有像initialViewController 那样的视图，但我有故事板，我想选择那取决于是否记录，例如。

我有AppDelegate

func application(application: UIApplication, didFinishLaunchingWithOptions: [NSObject: AnyObject]?) -> Bool
    { 
let storyboard = UISToryboard(name: "Main", bundle: nil)
if isLogged{
//Access to DatesViewController
let vc = storyboard.instantiateViewControllerWithIdentifier("dates")
self.window?.rootViewController?.presentViewController(vc, animated:true,completion: nil)


}else{
//Access to LoginViewController
let vc = storyboard.instantiateViewControllerWithIdentifier("login")
    self.window?.rootViewController?.presentViewController(vc, animated:true,completion: nil)
}
self.window?.makeLeyAndVisible()
return true

我不知道如何做到这一点，有很多关于objetiveC的信息，但对于Swift没有。

这不起作用，错误是：*

无法为UIMainStoryBoardFile“Main”实例化默认视图控制器 - 或者未设置指定的入口点？

*

如果你能帮助我，请谢谢！

这项工作：

func application(application: UIApplication, didFinishLaunchingWithOptions: [NSObject: AnyObject]?) -> Bool
    { 
let storyboard = UISToryboard(name: "Main", bundle: nil)
if isLogged{
//Access to DatesViewController
var vc = self.window?.rootViewController?.storyboard?.instantiateViewControllerWithIdentifier("dates")
self.window?.rootViewController = vc 


}else{
//Access to LoginViewController
var vc = self.window?.rootViewController?.storyboard?.instantiateViewControllerWithIdentifier("login")
self.window?.rootViewController = vc 
}
self.window?.makeLeyAndVisible()
return true