View Controller being sent a message even though it has been deallocated

Question

I am not sure if something has changed in the iPhone SDK 3.0 but I am getting the strangest error. I have a view controller hierarchy where I switch between view controllers

Answer 1

So after a week of waiting, Apple Developer Technical Support managed to help me sort my problem out. Here is their response:

"I've looked over your code and found a few things you need to be concerned about, some of which may contribute to your problem. In your ControllerSwitchAppDelegate.m source, you are implementing "didRotate" method. It might be worth checking for device orientation notifications at the view controller level rather than at the UIApplication level. This will make your code much more simpler and encapsulated allowing each view controller that is shown to handle its own rotation logic. You are also using multiple view controllers at the same time, that being, both "view" properties are being added and remove when the device is rotated. This is not exactly the common approach in which to use the UIKit. The idea is to present one view controller (or its view property) at a time and not have a parent view controller swap in different sub-view controllers. Granted on the surface your approach seems doable, but in the long run, I recommend a different approach.

We have a sample called "AlternateViews", which can be found at - http://developer.apple.com/iphone/library/samplecode/AlternateViews/index.html

In this sample, it pretty much does what you need. It provides an "alternate" view controller for a given device orientation. Is merely presents one view controller over another using "presentModalViewController" with a transition property called "modalTransitionStyle" which will give you a cross fade affect."

What I ended up doing was using a super view controller that presented and dismissed view controllers. Rather than swapping view controllers and removing sub views using the AppDelegate.