viewDidLoad gets called, viewWillAppear does not get called, view does not appear on screen

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

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 2

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.