My app currently basically wires the AQGridView project to the leaves project to make an iBooks (clone-esque) type PDF reader. My problem is, I currently use the pageCurl transition from one view to the next, which is all well and good, but I want to take it to the next level. Has anyone duplicated the iBooks unfolding/ folding book+cover animation? Every question I see about this is just up voted twice with the most noobish and incoherent answers I've ever seen (example a: How to show Book Opening and loading animation as in iBooks?).
Again, for clarification: I know HOW to read the PDF, I'm looking for a view TRANSITION.
EDIT 1: this recent question provided the first half of the answer (expanding the view to fill the screen) File opening animation like in iBooks and Photos.app on iPad
I won't write the code for you, but what you're trying to do does sound like a keyframe animation. It's a lot more verbose than using UIView's wrapper to create animations, but you can do much more with it.
来源：https://stackoverflow.com/questions/8499601/open-close-unfolding-book-animation-in-ibooks