iOS notified when control center is opened like QuizUp do

Question

How can I be notified when the iOS Control Center is being opened?

UIApplicationWillResignActiveNotification isn't good enough since this notification is sent also when the Notifications Center is opened, alert view appeared and other possible scenarios.

I was sure this is not possible, but QuizUp app is notified when the user open the Control Center while the user is on middle of a gameplay to prevent cheating the game.

Thanks

Answer 1

Hey there I did a lot of trial and error investigation and came up with a solution that turns out being very reliable. It works in all orientations and both in fullscreen (no statusbar) and in regular mode. AAWindow is a subclass of UIWindow and you can find it on GitHub.

The way I accomplished this is by overriding sendEvent in UIWindow, separating out TouchEvents from the other events and checking whether touches occur in the bottom 10 percent of the screen (which is the part that can open Control Center). If there are touches and applicationWillResignActive is called within a timespan of .5 seconds (with statusbar) or 3 seconds (without statusbar) you can be very sure that this is because of Control Center being opened. Then a NSNotification is being fired and you can react to that anywhere in the application.