iOS6と7でUITabBarItemに選択と非選択画像をつける

UITabBarItem.iOS6_7.m

- (void)setTabBarItem:(UITabBarItem *) tabBarItem tabBarItemSelectedIcon:(UIImage *) tabBarItemSelectedIcon tabBarItemUnselectedIcon:(UIImage *) tabBarItemUnselectedIcon {
    BOOL isSupportRenderingType = [tabBarItemUnselectedIcon respondsToSelector:@selector(imageWithRenderingMode:)];
    UIImage *selectedImage = isSupportRenderingType
                             ? [tabBarItemSelectedIcon imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]
                             : tabBarItemSelectedIcon;
    UIImage *unselectedImage = isSupportRenderingType
                               ? [tabBarItemUnselectedIcon imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]
                               : tabBarItemUnselectedIcon;
    tabBarItem.image = unselectedImage;
    if ([tabBarItem respondsToSelector:@selector(selectedImage)]) {
        [tabBarItem setSelectedImage:selectedImage];
    } else {
        [tabBarItem setFinishedSelectedImage:tabBarItemSelectedIcon withFinishedUnselectedImage:tabBarItemUnselectedIcon];
    }
}