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Can the opacity of a CCSprite in a CCSpriteBatchNode be modified?
The following doesn’t seem to work:
((CCSprite *)[batchNode getChildByTag:myTag]).opacity = 0.5;
The sprite just disappears instead of showing up with modified opacity.
This is why it’s a good idea to look at the types.
opacityproperty ofCCSpriteis GLubyte. Looking at GLubyte’s typedef, we see that it’s actually unsigned char, which means that it takes integer values from 0 to 255. Withsprite.opacity = 0.5you implicitly convert floating point value to unsigned char, fractional part of 0.5 is truncated, and sprite.opacity becomes 0.