Code for create UIScrollView (which named scrollView) and specify size of content (width and height) inside scrollView.

var scrollView = UIScrollView(frame: containerView.frame)

scrollView.contentSize = CGSize(width: 3000, height: 2000)

containerView.addSubview(scrollView)

// can be any view that is container of scrollView

Use these following code if you need to catch event while scroll and zoom scrollView.

[don’t forget to add delegate]
UIScrollViewDelegate // add at top of class
scrollView.delegate = self // add at viewDidLoad()

func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? { return imageView }
// return any view that you want to zoom in or out

func scrollViewDidZoom(scrollView: UIScrollView) { /* code for do something while zooming scrollView */ }

func scrollViewDidScroll(scrollView: UIScrollView) { /* code for do something while scrolling scrollView */ }