viewDidDisappear not getting called on a UINavigationController

Question

I\'m having a problem with my navigation controller. If I add a view controller to the stack:

- (void) tui_ToggleListStudy:(id)sender
{
    listVC = [[ListViewCo         


        

Answer 1

You must call super at implementation of viewWillDisappear.

Answer 2

The designated initializer for UIViewController is -initWithNibName:bundle:. Are you sure your view controller is finding its nib and finds its connected view? I'll bet if you set a breakpoint after init'ing your ListViewController, you'll find its -view returns nil.

Answer 3

Assuming your navigation controller is contained in some kind of top view controller, you must also forward the relevant messages from that top view controller to the nav controller:

-(void)viewWillAppear:(BOOL)animated
{
    [navController viewWillAppear:animated];
}

-(void)viewDidAppear:(BOOL)animated
{
    [navController viewDidAppear:animated];
}

-(void)viewWillDisappear:(BOOL)animated
{
    [navController viewWillDisappear:animated];
}

-(void)viewDidDisappear:(BOOL)animated
{
    [navController viewDidDisappear:animated];
}

Answer 4

I know the answer if you made the same typo in your code that you made in your question: the method signature is viewDidDisappear: (with the animated argument), not viewDidDisappear.

Not only that, but the view controller doesn't receive any other delegate messages either: No viewDidUnload, or dealloc...

A view controller will not be deallocated when you push another controller onto the stack. And viewDidUnload won't be called unless you run out of memory.