把两个Layer融合成一个UIImage的截图方法

    //layer1

        CCLayer *layer1 = [CCLayer node];

        CGPoint p1 = layer1.anchorPoint;

        [layer1 setAnchorPoint:ccp(0,0)];

        CCRenderTexture *renderer01 = [CCRenderTexture renderTextureWithWidth: layer1.contentSize.width height: layer1.contentSize.height];

        [renderer01 begin];

        [layer1 visit];

        [renderer01 end];

        [layer1 setAnchorPoint: p1];

        UIImage *image1 = [UIImage imageWithData:[renderer01 getUIImageAsDataFromBuffer:kCCImageFormatPNG]];

    //layer2

       CCLayer *layer2 = [CCLayer node];

       CGPoint p2 = layer2.anchorPoint;

       [layer2 setAnchorPoint:ccp(0,0)];

       CCRenderTexture *renderer02 = [CCRenderTexture renderTextureWithWidth: layer2.contentSize.width height: layer2.contentSize.height];

       [renderer02 begin];

       [layer2 visit];

       [renderer02 end];

       [layer2 setAnchorPoint: p2];

       UIImage *image2 = [UIImage imageWithData:[renderer02 getUIImageAsDataFromBuffer:kCCImageFormatPNG]];   

        //GC来了两个层开始融合

        UIImage *image;

        if (UIGraphicsBeginImageContextWithOptions != NULL) {

            UIGraphicsBeginImageContextWithOptions(srcSize, YES, 0);

        } else {

            UIGraphicsBeginImageContext(srcSize);

        }

        [image1 drawInRect:CGRectMake(0, 0, srcSize.width, srcSize.height)];

        [image2 drawInRect:CGRectMake(0, 0, srcSize.width, srcSize.height)];

        image = UIGraphicsGetImageFromCurrentImageContext();

        UIGraphicsEndImageContext();