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I am implementing an application which is used to draw images and text.User can create page and draw in that and save that page in document directory of application. But i am not able to figure out how to restore all the views he had added to the pages when user reopens the same document to edit it.
you could serialize your UIView means you can encoded and decoded your view object because UIVIew implement the NSCoding protocols ..
Check out the below SO link for encoded and decoded your UIView object
How to serialize a UIView?
You could do the modification and also maintain the version easily.