cocos2d-iphone – cocos2d.正确混合？

CCSprite *sprite = [CCSprite spriteWithFile:@"Untitled-1.png"];
        CGSize winSize = [CCDirector sharedDirector].winSize;
        sprite.position = ccp(winSize.width / 2, winSize.height / 2);
        [label setBlendFunc:(ccBlendFunc){GL_ZERO, GL_SRC_ALPHA}];
        [label setColor:ccBLACK];
        [sprite addChild:label];
        [self addChild:sprite];

我有：

image

如何删除/剪切“Hello World”标签周围的背景？

CCLabelTTF *label = [CCLabelTTF labelWithString:@"Hello World" fontName:@"Marker Felt" fontSize:64 dimensions:size hAlignment:kCCTextAlignmentCenter vAlignment:kCCVerticalTextAlignmentCenter];

其中size是[CCDirector sharedDirector] .winSize for my examle.

欢迎任何其他建议