UINavigationController扩展

-(void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated

{

    if (self.viewControllers.count) {

        viewController.hidesBottomBarWhenPushed = self.viewControllers.count;

    }

    [superpushViewController:viewController animated:YES];

}

UINavigationController扩展,布布扣,bubuko.com

UINavigationController扩展

原文：http://www.cnblogs.com/ios520/p/3684975.html