How to exit UINavigationController?

[samurle]

If I created a UINavigationController programmatically, how would I exit it?
Exit, as in deallocate it from memory.

For example, let's say my app starts off with a full-screen main menu with some buttons,
and then when I click on a button, I create a navigation controller with its own view.

How would I then exit the navigation controller, and go back to the main menu?

[baja_yu]

It's not clear what you mean. The tile mentions navigation controller but then you talk about navigation bar. Those aren't the same. How you dispose of it depends on how you create and present it. What you allocate you must release, if you present a modal view controller you need to dismiss it. If you add it as a subview you need to remove it from its superview... etc.

[samurle]

Originally Posted by baja_yu

It's not clear what you mean. The tile mentions navigation controller but then you talk about navigation bar. Those aren't the same. How you dispose of it depends on how you create and present it. What you allocate you must release, if you present a modal view controller you need to dismiss it. If you add it as a subview you need to remove it from its superview... etc.

I corrected it.

This is a navigation controller.

It's not a modal view controller, there's nothing to dismiss.
It's not a view, there's nothing to remove from a superview.

How to exit it?

[sr.ramarao2009590]

self.navigationController.hidden=YES;

[samurle]

Originally Posted by sr.ramarao2009590

self.navigationController.hidden=YES;

Please read my post again.

How to exit through memory deallocation, as I stated in my question.

[BrianSlick]

How are you putting it onto the screen in the first place?

[samurle]

Originally Posted by BrianSlick

How are you putting it onto the screen in the first place?

I allocate it programmatically:

RooViewController *rootViewController = [[RooViewController alloc] init;
[self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
[self.window makeKeyAndVisible];

How to exit the navigation controller from inside it's root view?

[BrianSlick]

1. You're leaking it. See the properties link in my signature for guidance.
2. Assuming you are replacing the root controller like this:

self.window.rootViewController = anotherViewController;

...then that's all you need to do (other than properly releasing both the RooViewController and navigation controller)

[samurle]

Originally Posted by BrianSlick

1. You're leaking it. See the properties link in my signature for guidance.
2. Assuming you are replacing the root controller like this:

self.window.rootViewController = anotherViewController;

...then that's all you need to do (other than properly releasing both the RooViewController and navigation controller)

Thanks for the help!

If I set self.window.rootViewController to nil or to another controller, should my root view's
viewDidUnload method get called? Because I added a NSlog in that method, and it doesn't get called.

I'm just trying to find some indication that the rootViewController has been deallocated.

[BrianSlick]

viewDidUnload is not part of the teardown routine, so no. Put a log in dealloc. Or use Instruments.

[samurle]

Originally Posted by BrianSlick

viewDidUnload is not part of the teardown routine, so no. Put a log in dealloc. Or use Instruments.

I added these lines, but I think they're overkill and not needed. Since I'm already at the rootView when all of this happens.
viewDidUnload still doesn't get called, but viewDidDisappear does get called.

[self.navigationController popToRootViewControllerAnimated:TRUE];
[self.navigationController dismissModalViewControllerAnimated:TRUE];

[self.view removeFromSuperView];
[self.window.rootViewController.view removeFromSuperView];

self.view = nil;
self.window.rootViewController.view = nil;

// Last line
self.window.rootViewController = nil;

I think the last line is all I need.

And exiting this way does create one small problem. The exit happens very fast. Too fast. It's not animated.
So, the exit either needs to be animated, or some kind of transition needs to happen.

[BrianSlick]

You're going to have to do something manual to animate that.