当应用程序进入后台时，popToRootViewController

Question

In the didFinishLaunchingWithOptions of my application , the code is

   _homeViewController = [[HomeViewController alloc]init];
    UINavigationController*  _navigationController = [[UINavigationController alloc] initWithRootViewController:_homeViewController];
    [self.window setRootViewController:_navigationController];
    [_navigationController setNavigationBarHidden:YES];
    [self.window makeKeyAndVisible];

and in the HomeViewController , I am having two buttons, If the button is pressed , I am presenting the ViewController. If button1 is pressed , the code is

if (_detailsViewController == nil)
            _detailsViewController = [[DetailsViewController alloc]init];

       [self.navigationController presentModalViewController:_detailsViewController animated:YES];

Now when I am in the detailsViewController and I pressing the iPhone Home button, in the same class I am using the UIApplicationDidEnterBackgroundNotification and calling a method to execute the following line

[self.navigationController popToRootViewControllerAnimated:YES];

So I thought when I open the application again, I can see the HomeViewController, but it doesn't work. Please help me !!

Answer 1

当您进入背景时，保存一条状态信息，当您重新进入前景时，检查该信息，如果设置了标志，则在其中弹出而没有动画。

Answer 2

看来我无法弹出到根视图的原因是，我在两者之间显示了ViewController，如果ViewController随导航控制器一起提供，即，如果ViewController被推为导航控制器，那么我可以弹出到根视图控制器