Write a function #1 that loads the images into the view.
Call function #1 from viewDidLoad.
Write a function #2 that removes the first set of images from the view.
Write a function #3 that loads the new images.
Call #2, then #3 when you need to change the images. You can also use pdf's and you can skip to a specific page after you load the images.
The reason you need to swap things out is that the PDF or images are converted into a digital mesh that allows the cool curve page turning look. It is already optimized so only the previous page, current page, and next page are held in memory.