Recommendations to Develop an iOS Game

I have never developed an iOS game and I want to get that a basic character (a circle like head and five lines as arms, trunk and legs) walks over a line (it has to recognize the line), falling down when the line ends and without allowing user interaction. Is there a tutorial to do this? Should I use just Objective-C or must I use any other technology like Cocos2D?

Thanks for reading.

Edited:

All the action occurs in 2D 开发者_Go百科and on a single screen. I think that I need an animation and to check collisions to know if the character must keep walking or fall down.

There's a lot going on in that scenario you describe:

1. Animated rendering
2. Scene management (scene graphs)
3. Inverse kinematics
4. Collision detection

I doubt you'll find a single simple tutorial that covers all this. You'll probably need to study each of these areas separately.

Since Objective-C is just a programming language, you will definitely need something more. If it's 2D, Cocos2D will certainly do the job, but for the amount of rendering activity you describe, it may be overkill. CoreGraphics will probably suffice.