I found that the Sparrow Framework API is much cleaner and more consistent than Cocos2D. You will also receive much better official documentation to start developing Sparrow, and the developer is very responsive in the forum. The Cocos2D Wiki is quite incomplete and partially outdated, and the forum is so crowded and foolish that it is difficult to find buried stones.
However, Cocos2D is extremely popular, and there are several more tutorials available on the Internet (see http://www.raywenderlich.com ) and books (like mine: http://www.learn-cocos2d.com/store / book-learn-cocos2d / ). You will also find more developers to ask for help.
Then there Kobold2D , which (but I'm biased) is an exciting alternative to Cocos2D with 15+ sample projects, integrated important source code (cocos3d, extensions cocos2d, Lua), all API links are available on the Internet, offline and in the form of Xcode help, and also in support of cross-platform (iOS and Mac OS).
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