applicationDidEnterBackground: is not being called

Question

I am creating a video editing app for iPhone.

When the user sets up the video editing and then starts the rendering, obviously it takes time. When the user presses the home button, the application is minimized but the rendering still continues and applicationDidEnterBackground: is not getting called unless the rendering process finishes.

Answer 1

Can you post the code that performs the rendering?

If it's a blocking call that takes a lot of time to complete and you are doing it in the main runloop, you are clogging up the run loop. Your rendering code would need to finish before applicationDidEnterBackground would be called, and if this takes too long, iOS will simply kill your application instead. IT would also freeze the UI, which you definitely don't want.

The most likely solution would be to move your rendering code to a background thread, but it really depends on what you are doing.