according to this post for now, Is apple will also reject this code?

and how to implement what apple will approve?

@interface UITabBar (ColorExtensions)
- (void)recolorItemsWithColor:(UIColor *)color shadowColor:(UIColor *)shadowColor shadowOffset:(CGSize)shadowOffset shadowBlur:(CGFloat)shadowBlur;
@end

@interface UITabBarItem (Private)
@property(retain, nonatomic) UIImage *selectedImage;
- (void)_updateView;
@end

@implementation UITabBar (ColorExtensions)
- (void)recolorItemsWithColor:(UIColor *)color shadowColor:(UIColor *)shadowColor shadowOffset:(CGSize)shadowOffset shadowBlur:(CGFloat)shadowBlur
{
        CGColorRef cgColor = [color CGColor];
        CGColorRef cgShadowColor = [shadowColor CGColor];
        for (UITabBarItem *item in [self items])
                if ([item respondsToSelector:@selector(selectedImage)] &&
                    [item respondsToSelector:@selector(setSelectedImage:)] &&
                    [item respondsToSelector:@selector(_updateView)])
                {
                        CGRect contextRect;
                        contextRect.origin.x = 0.0f;
                        contextRect.origin.y = 0.0f;
                        contextRect.size = [[item selectedImage] size];
                        // Retrieve source image and begin image context
                        UIImage *itemImage = [item image];
                        CGSize itemImageSize = [itemImage size];
                        CGPoint itemImagePosition; 
                        itemImagePosition.x = ceilf((contextRect.size.width - itemImageSize.width) / 2);
                        itemImagePosition.y = ceilf((contextRect.size.height - itemImageSize.height) / 2);
                        UIGraphicsBeginImageContext(contextRect.size);
                        CGContextRef c = UIGraphicsGetCurrentContext();
                        // Setup shadow
                        CGContextSetShadowWithColor(c, shadowOffset, shadowBlur, cgShadowColor);
                        // Setup transparency layer and clip to mask
                        CGContextBeginTransparencyLayer(c, NULL);
                        CGContextScaleCTM(c, 1.0, -1.0);
                        CGContextClipToMask(c, CGRectMake(itemImagePosition.x, -itemImagePosition.y, itemImageSize.width, -itemImageSize.height), [itemImage CGImage]);
                        // Fill and end the transparency layer
                        CGContextSetFillColorWithColor(c, cgColor);
                        contextRect.size.height = -contextRect.size.height;
                        CGContextFillRect(c, contextRect);
                        CGContextEndTransparencyLayer(c);
                        // Set selected image and end context
                        [item setSelectedImage:UIGraphicsGetImageFromCurrentImageContext()];
                        UIGraphicsEndImageContext();
                        // Update the view
                        [item _updateView];
                }
}
@end