Tells the delegate when the app receives a memory warning from the system.
- iOS 2.0+
- tvOS 9.0+
Your singleton app object.
Your implementation of this method should free up as much memory as possible by purging cached data objects that can be recreated (or reloaded from disk) later. You use this method in conjunction with the
did of the
UIView class and the
UIApplication notification to release memory throughout your app.
It is strongly recommended that you implement this method. If your app does not release enough memory during low-memory conditions, the system may terminate it outright.