UINavigationController 返回总结

1.当前视图控制器消失，并向左显示前一个视图
[self.navigationController popViewControllerAnimated:YES];
 
2.返回到根视图控制器
[self.navigationController popToRootViewControllerAnimated:YES]; 

3.返回到指定视图控制器（回到指定视图控制器，也就是不只弹出一个）
[self.navigationController popToViewController:viewController animated:YES];
 
例如：

[self.navigationController popToViewController: [self.navigationController.viewControllers objectAtIndex: ([self.navigationController.viewControllers count] -3)] animated:YES];

    for (UIViewController *controller in self.navigationController.viewControllers)
{
        if ([controller isKindOfClass:[你要跳转到的Controller class]]) {
            [self.navigationController popToViewController:controller animated:YES];
        }
    }