Cannot add viewcontroller´s frame to a scrollview in another viewcontroller - xcode

Question

I want to add a swipe function to my app and swipe between viewcontrollers as in this tutorial: https://www.youtube.com/watch?v=3jAlg5BnYUU
The source code for the tutorial is here: https://www.veasoftware.com/posts/swipe-navigation-in-swift-xcode-7-ios-9-tutorial
In that guide they are using nib/xib files that they create together with the corresponding viewcontrollers that they then use to call for in their ViewController´s constructors.
I have done exact the same and it is wokring as in the tutorial. But I also want use a ViewController that not has a xib file because it is on my storyboard. That viewcontroller is called ViewController2 in my code below and it is the only that does not appear in the scrollview when I swipe. The other two do because I call for the xibName in the constructor call but ViewController2 does not have a xib file since it is on my storyboard.
So how can I add it to the scrollview so it appears when I swipe?
#IBOutlet weak var scrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
let vc0 = ViewController0(nibName: "ViewController0", bundle: nil)
self.addChildViewController(vc0)
self.scrollView.addSubview(vc0.view)
vc0.didMoveToParentViewController(self)
let vc1 = ViewController1(nibName: "ViewController1", bundle: nil)
var frame1 = vc1.view.frame
frame1.origin.x = self.view.frame.size.width
vc1.view.frame = frame1
self.addChildViewController(vc1)
self.scrollView.addSubview(vc1.view)
vc1.didMoveToParentViewController(self)
let vc2 = ViewController2()
var frame2 = vc2.view.frame
frame2.origin.x = self.view.frame.size.width
vc2.view.frame = frame2
self.addChildViewController(vc2)
self.scrollView.addSubview(vc2.view)
vc2.didMoveToParentViewController(self)
self.scrollView.contentSize = CGSizeMake(self.view.frame.size.width * 3, self.view.frame.size.height - 66);
}

Answer 1

Try doing the following:
1) Getting the storyboard object programmatically.
2) Giving the View Controller 2 in your storyboard file a storyboard ID. You can do this by going to your Main.storyboard file and selecting the view controller you wish to give an identifier and then looking in the Identity Inspector (It should be in the under "Identity" section.
3) Instantiating an instance of View Controller 2 with the storyboard method instantiateViewControllerWithIdentifier. This method uses a storyboard ID as it's argument and adding that as the child of your scroll view.
Like so:
#IBOutlet weak var scrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
//1
let mainStoryboard = UIStoryboard.init(name: "Main", bundle: NSBundle.mainBundle())
//3
let vc2 = mainStoryboard.instantiateViewControllerWithIdentifier("<InsertStoryBoardID>") as! ViewController2
self.addChildViewController(vc2)
self.scrollView.addSubview(vc2.view)
vc2.didMoveToParentViewController(self)
self.scrollView.contentSize = CGSizeMake(self.view.frame.size.width * 3, self.view.frame.size.height - 66);
}
Hope this helps! Feel free to ask questions!