iPad application will be for a long time on hold
After the iPad will often encounter such a situation, open an application and then directly lock screen or do not operate, so for a few days, after unlocking the screen, this application is still in the state a few days ago, can continue to operate without killed or reboot the system.
So some business to take into account this situation, you can monitor the application UIApplication.willResignActiveNotification, UIApplication.willEnterForegroundNotificationor UIApplication.didBecomeActiveNotificationthe state for processing.
Reproduced in: https: //www.jianshu.com/p/b30d226b90ca