我试图在精灵图像上叠加颜色，并对如何将颜色与精灵混合有疑问 . 我已经使用以下 updateImageTint 例程在 UIImage 上叠加颜色，输出就是我所希望的 . 图像保持白色，但灰色阴影饱和或使用指定的叠加颜色进行刻录 . 参数 kCGBlendModeColor 好像是标准 UIImage 颜色混合的技巧 .
但是，我试图使用精灵获得相同的效果，但颜色看起来就像是's coloring on top of the entire image, white areas and all. I' m，假设这是一个混合问题 . 是否有一组参数可以传递给setBlendFunc以使输出与下面的 updateImageTint 方法匹配？
我试过这个......但没有运气
[spriteToAdjust setBlendFunc: (ccBlendFunc) { GL_ONE, GL_ONE }];
[spriteToAdjust setColor:ccc3(red*255.0,green*255.0,blue*255.0)];
-(UIImage*) updateImageTint:(UIImage*) img toColor:(UIColor*) toColor
{
// begin a new image context, to draw our colored image onto
UIGraphicsBeginImageContext(img.size);
// get a reference to that context we created
CGContextRef context = UIGraphicsGetCurrentContext();
// set the fill color
UIColor *color = toColor;
[color setFill];
// translate/flip the graphics context (for transforming from CG* coords to UI* coords
CGContextTranslateCTM(context, 0, img.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
// set the blend mode to color burn, and the original image
CGContextSetBlendMode(context, kCGBlendModeColor);
CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height);
CGContextDrawImage(context, rect, img.CGImage);
// set a mask that matches the shape of the image, then draw (color burn) a colored rectangle
CGContextClipToMask(context, rect, img.CGImage);
CGContextAddRect(context, rect);
CGContextDrawPath(context,kCGPathFill);
// generate a new UIImage from the graphics context we drew onto
UIImage *coloredImg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//return the color-burned image
return coloredImg;
}