在转换期间关闭显示错误视图的多个视图控制器

Question

我总共有4个UIViewControllers。每个视图都有一个按钮，按下时会显示下一个视图控制器。当按下最后一个UIViewController上的按钮时，它会在rootViewController上调用dismissViewControllerAnimated（true，，completion：nil）。当调用它时，它会立即显示View＃2，而不是继续使用View＃4，因为它会转换回View＃1。在文档中，它表示当你这样做时，最顶层的视图是唯一一个在解雇期间将被动画化的视图，但对我来说情况并非如此？如果我使用segues也会发生这种情况。

class ViewController1: UIViewController {
    @IBAction func btnDidTouch(sender: AnyObject) {
        var viewController = self.storyboard!.instantiateViewControllerWithIdentifier("ViewController2") as! UIViewController
        self.presentViewController(viewController, animated: true, completion: nil)
    }
}
class ViewController2: UIViewController {
    @IBAction func btnDidTouch(sender: AnyObject) {
        var viewController = self.storyboard!.instantiateViewControllerWithIdentifier("ViewController3") as! UIViewController
        self.presentViewController(viewController, animated: true, completion: nil)
    }
}
class ViewController3: UIViewController {
    @IBAction func btnDidTouch(sender: AnyObject) {
        var viewController = self.storyboard!.instantiateViewControllerWithIdentifier("ViewController4") as! UIViewController
        self.presentViewController(viewController, animated: true, completion: nil)
    }
}
class ViewController4: UIViewController {
    @IBAction func btnDidTouch(sender: AnyObject) {
        self.view.window?.rootViewController!.dismissViewControllerAnimated(true, completion: nil)
    }
}