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http://www.raywenderlich.com/tutorials awesome source Some CG Functions http://blogs.oreilly.com/iphone/2008/12/useful-core-graphics-functions.html

Hi While writing a software one has to work across multiple files and its easy to forget those mental notes we make to revisit certain parts of the code. Objective C and Xcode provide some niftly tags to mark these areas in the code. The Tags are: 1) TODO Syntax: // TODO: add function call 2) FIXME Syntax: // FIXME: remove view and add image 3) ??? Syntax // ???: How does this work? 4) !!! Syntax // !!!: to be verified Via: http://iphonedevelopertips.com/xcode/xcode-fixme-and-todo.html