iosdidreceivememorywarningios-extensionsnetworkextension

How to detect memory warnings in iOS App Extension

I'm writing an iOS extension that extends NEPacketTunnelProvider in the NetworkExtension framework released in iOS 9. I'm running into a situation where iOS is killing the extension once hits 6MB of memory used.

In a regular iOS app, there are two ways to detect memory warnings and do something about it. Either via [UIApplicationDelegate applicationDidReceiveMemoryWarning:(UIApplication*)app] or [UIViewController didReceiveMemoryWarning]

Is there a similar way to detect memory warnings within an extension? I've searched up and down the iOS extension documentation but have come up empty thus far.

Solution

  • I am not very familiar with the extensions API, however my basic hunch says that you can register any of your object as observers of UIApplicationDidReceiveMemoryWarningNotification from within that class:

    NSNotificationCenter.defaultCenter().addObserverForName(UIApplicationDidReceiveMemoryWarningNotification,
  object: nil, queue: .mainQueue()) { notification in
    print("Memory warning received")
}