navigationController pop的几种方法

[self.navigationController popViewControllerAnimated:YES];

[self.navigationController popToRootViewControllerAnimated:YES];

[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:2] 
      animated:YES];

//假如你要跳转到DeskViewController
for (UIViewController *temp in self.navigationController.viewControllers) {            
            if ([temp isKindOfClass:[DeskViewController class]]) {
                [self.navigationController popToViewController:temp animated:YES];
            }
        }