Sometimes, interruptions such as phone call occur and disturb a regular behavior of an app in iPhone or iPad.
For example, I created one UIScrollView instance and implemented UIScrollView delegate methods: scrollViewWillBeginDragging and scrollViewDidEndDragging(and scrollViewDidEndDecelerating).
A scrollViewWillBeginDragging method deactivated all custom buttons in my app.
Then scrollViewDidEndDragging and scrollViewDidEndDecelerating methods activated these custom buttons. That is, while the user scrolled, all custom buttons became deactivated for a while.
The problem was that while the user
started to drag and just held an
UIScrollView instance, if I took a
screenshot by pressing a home button
and a power button, then any of
scrollViewDidEndDragging and
scrollViewDidEndDecelerating didn't
get called. So the app became messed
up.
I implemented a UIApplicationWillResignActiveNotification method in my UIViewController, but it didn't get called after taking a screenshot.
How can I catch any kind of interruption that disturbs a regular flow of events?
Sometimes, touchesEnd and touchesCanceled didn't get called too due to an interruption.
Thank you.