A demo project showing how to correctly snapshot the contents UIScrollView and its subclasses.
Historically, the suggested approach to snapshotting a scrollview was to resize the scroll view's frame to match its contentSize. This became inconvenient with the introduction of autolayout on iOS.
This example scrolls through the contents of a scrollview subclass (in this case a collection view) and generates a PDF.
The magic comes from translating the core graphics current transformation matrix along with the contentOffset. Check out the ScrollViewSnapshotter class for implementation details and a ton of notes. Those notes are also available on my blog.
MIT