animation ios swift uicontainerview

How to display an container view with animation in iOS?

I want to display my own custom view when an user taps an button in the original view controller, and so I tried to define the following function which is caused when the user taps the button:

func show() {
vc = UIViewController()
var button = UIButton(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
button.backgroundColor = UIColor.redColor()
button.addTarget(self, action: "hide", forControlEvents: UIControlEvents.TouchDown)

When the user taps the button however, the container view is displayed on the screen abruptly, but I want to make it shown more smoothly. So next I tried to rewrite it with animation, but I’ve hit the wall, since I don’t know what I should write in order to display it with animation:

transitionFromViewController(self, toViewController: vc, duration: 0.5, options: UIViewAnimationOptions.TransitionCrossDissolve, animations: {() -> Void in
}, completion: {
Bool -> Void in

This returns an error: 'NSInvalidArgumentException', reason: 'Children view controllers <mmmmlvalsllsl.ViewController: 0x7fc980f71f70> and <UIViewController: 0x7fc980f6dd00> must have a common parent view controller when calling -[UIViewController transitionFromViewController:toViewController:duration:options:animations:completion:]'.

I think I should use the method, but I don’t know what code to write in animations: block and what to completion: block.

How can I write the animation code?