viewDidLoad gets called, viewWillAppear does not g

Question

Update

It has been mentioned that viewWillAppear and viewDidAppear do not get called per the docs. However, I perform no initialization within these methods and no adding UI elements to the view.

I was just using them to place break points to try to debug this.

Any other ideas?

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Original Question

I'm stumped. I'm refactoring some code and have come across some strange behavior....

I initialize viewController A without a nib and set the view programmatically.

viewDidLoad in controller A gets called.

Inside viewDidLoad of viewController A, I initialize viewController B from a nib.

I add viewControllerB.view as a subview of viewControllerA.view

viewDidload of controller B gets called.

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Then it gets weird:

1. viewWillAppear and viewDidAppear of viewController B never get called.

2. viewControllerB.view never makes it on screen.

3. No errors.

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Things I checked:

The name of the viewControllerBs Nib is correct.

The view outlet of viewControllerB is connected to a view.

viewControllerB and its view both are non-nil.

And to top it off, everything works great in SDK [redacted] beta 5!

Any ideas? It's got to be something silly..

Answer 1

Don't forget to call

[super viewWillAppear:animated];

Wherever you redefine it.

The documentation says:

If you override this method, you must call super at some point in your implementation.

Answer 2

I guess your view is not the root view. You are probably using a UINavigationController so try to implement this method

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated

or this one

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated

and add in your viewDidLoad

this.navController.delegate = self;

(don't forget to add the UINavigationControllerDelegate protocol in your .h file.

Answer 3

To close the matter:

I could never find a solution, but since then SDK 3.0 is the standard and the point has become moot. The code does work correctly in current versions of the SDK.

Answer 4

If the view controller is added to a view hierarchy through code, the view controller will not get viewWillAppear (or viewDidAppear) messages. If you add it yourself you have to send the view controller the message yourself.

Answer 5

Try

-(void) viewDidAppear:(BOOL)animated {
// whatever
}