Use your iPhone to take a picture of a Go board and export the sgf.
Export to SmartGo or CrazyStone for editing or counting, or send the sgf as email.
Download the project tarball here.
Then, assuming you're on a Mac and have Xcode:
tar xzvf kifu-cam.tar.gz
cd kifu-cam
git pull origin master
open KifuCam.xcodeproj
Connect your iPhone, hit the play button.
Kifu Cam is written without *.xib files or storyboards. If you are looking for a pure code iOS project, you found one.
All user interface stuff is written in Objective-C.
The algorithmic core makes heavy use of OpenCV and is written in C++. Feel free to pilfer and reuse.
Kifu Cam is in the App Store.