Erasing Image in xcode/cocos2d

I have an image paced on the screen.If the user开发者_如何学JAVA select the eraser and erase the image,it should be erased.How can i do that.

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Fake it? Put a sprite same color as the background over it.. Means a layer on top of the previous sprite..

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If it is a CCNode subclass (CCSprite for example) call

[myImage removeFromParentAndCleanUp: YES];