iOS 4 app flickers and crashes when returning from background mode

Question

I just converted an iPhone OS 3 app to iOS 4, and once in a while, the screen will flicker and then turn black when the app returns from background mode. Has anyone else experienced this?

I finally resorted to terminating the app before it enters background mode. This is definitely a temporary band aid:

- (void)applicationDidEnterBackground:(UIApplication *)application {
   // kill the app rather than letting it go into BG
   exit(0);
}

Any advice would be great. Thanks.

Answer 1

What is the system doing when it enters the foreground?

It sounds a lot like a memory warning may be triggering views to unload in odd ways. I'd do some testing in the simulator around firing memory warnings when in various screens.

I'm pretty sure your exit() trick would block app store submission.