问题
I was wondering what I would need to be able to use the red pulsing status bar with the app name, when the application goes to background-mode. I've seen several apps using this functionality, but I can't really find any information about it.
回答1:
If you have an active AudioQueue recording session, you will get the red status bar automatically.
来源：https://stackoverflow.com/questions/4605675/red-pulsing-status-bar-on-the-iphone