ios 根据颜色生成图片，十六进制颜色。

//颜色生成图片方法

- (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size {

CGRect rect = CGRectMake(0, 0, size.width, size.height);

UIGraphicsBeginImageContext(rect.size);

CGContextRef context = UIGraphicsGetCurrentContext();

CGContextSetFillColorWithColor(context,

color.CGColor);

CGContextFillRect(context, rect);

UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return img;

}

//十六进制颜色

#define UIColorFromRGB(rgbValue) [UIColor \

colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 \

green:((float)((rgbValue & 0xFF00) >> 8))/255.0 \

blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]