ACScrollView

A subclass of UIScrollView which allows for fast loading and infinite scroll.

ACScrollView is based on the observation that for paged scrollviews, all that is required to be loaded is the current page, and two surrounding pages. There are only three pages loaded at a time in ACScrollView: * The center page, showing the current page. * The left page, showing the previous page. * The right page, showing the next page.

When the user swipes from the center page to the left page, ACScrollView will reload three pages and jump the user to the center page, giving the illusion that the user is scrolling continuously.

Using ACScrollView

To use ACScrollView define the ACScrollViewDataSource methods: * numPagesIn(scrollView: ACScrollView) -> Int which specifies the number of pages in the scroll view. * viewFor(page:Int, within scrollView:ACScrollView) -> UIView which specifies a view to be shown in the scrollView for a specific page.

ACScrollView also provides delegate methods to abstract the custom implementation: * scrollViewDidScrollTo(location:CGPoint, within scrollView:ACScrollView) which provides a current offset as if the scroll view was a normal UIScrollView. * scrollViewDidScrollTo(page:Int, within scrollView:ACScrollView) which provides a page number to the delegate when a new page is scrolled to.

To-Do:

* Allow option for vertical scroll.
* Allow two-dimensional scroll view which allows the user to scroll both vertically and horizontally. 
* Allow option to disable infinite scroll.