颜色转image图片

+ (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 *image = UIGraphicsGetImageFromCurrentImageContext();           UIGraphicsEndImageContext();           return image;}