I'm still trying to figure out some issues with iOS 5 and iOS 4 in this incredibly complex (and not necessarily) complex application.
I traced one problem to the point where the controller (which happens to be the navigation controller of the calling class) has a parentViewController attached before the request for the current parentViewController is sent, but on the other hand, they didn’t even return viewWillAppear “presented” controller in viewWillAppear with a call), the navigation controller (I checked that it is the same address) suddenly has nil parentViewController .
I am sure that this behavior did not happen in iOS 4 (I tested ping-pong between the two versions to check the behavior).
The code is too complicated to include here, but the call is:
[self.navigationController presentModalViewController:messageViewController animated:[self isAnimated]]
Before the call, there are allegations that the parentViewController navigation is non-zero, as well as in viewWillAppear . The statement only fails in viewWillAppear .
source share