The Coding Monkey's version of Carcassonne is one of the great golden-era iOS games - sadly they eventually lost the rights to the board game, and this was removed from the app store and replaced with another developer's version. I'll admit I haven't played that version but nothing i've seen of it makes me believe it'll be a patch on this thoughtful interpretation.

No doubt eventually an iOS update will render this version unplayable on modern devices, and that will be a very sad day indeed.