The UIScrollView can be used explicitly with the control from the Object Library and manual creation through code. UIScrollView is also included within UITableView, UIWebView and UICollectionView.
So why use a scroll view, why are scroll views included in UITableView?
UIScrollView provides a mechanism to display content that is larger than the size of the application’s window and enables users to scroll within that content by making swiping gestures. 
UIScrollView has two sizes
As long as the content size is larger than the frame size, UIScrollView allows the user to pan around the images or other content within the control.
Here is another example of a very similar use case, but with a different implementation style.
Below is an example of configuring a UIScrollView with a large UIImage loaded from Wikicommons.
import UIKit let imageURL = NSURL(string: "http://upload.wikimedia.org/wikipedia/commons/5/5c/Double-alaskan-rainbow.jpg") let imageData = NSData(contentsOfURL: imageURL!) let largeImage = UIImage(data: imageData!) let imageView = UIImageView(image: largeImage) print("imageView size is \(imageView.bounds)") let scrollView = UIScrollView(frame: CGRectMake(0, 0, 300.0, 300.0)) scrollView.addSubview(imageView) scrollView.contentSize = imageView.bounds.size print("scrollView frame is \(scrollView.frame)") print("scrollView scrollable content size is \(scrollView.contentSize)")
The last two lines demonstrate that even though the view frame of the UIScrollView is 300x300, the content will scroll to the UIImageview size of 1919x1008
The UIScrollView functionality is more than just images, of course. You can create more powerful examples such as paging views and utilize delegate callbacks to observe notifications on scrolling behavior.
 Scroll View Programming Guide for iOS https://developer.apple.com/library/ios/documentation/WindowsViews/Conceptual/UIScrollView_pg/Introduction/Introduction.html