Navigation1 PUSH & POP

//1.进入第一 push

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

{

FirstViewController *firstVC = [[FirstViewController alloc] init];

[self.navigationController pushViewController:firstVC animated:YES];

}

//2.退出莫一页

//1. 退回到指定控制器

NSArray *arrayVC = self.navigationController.viewControllers;

UIViewController *viewController = arrayVC[1];

[self.navigationController popToViewController:viewController animated:YES];

// 2. 退回上一个界面

[self.navigationController popViewControllerAnimated:YES];

// 3. 直接返回到根视图

[self.navigationController popToRootViewControllerAnimated:YES];