CCWaves is one of the interesting functionalities in Cocos2D iphone.
Check out this following snippet to see how it works.
id my_wavesAction = [CCWaves actionWithWaves:7 amplitude:25 horizontal:NO
vertical:YES grid:ccg(15,10) duration:10];
[my_sprite runAction: [CCRepeatForever actionWithAction:my_wavesAction n]];
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