Simulate iOS on-device memory warnings like a hero.

debug, hero, ios, ios-app, kvo, kvocontroller, memory, simulator
pod try AllYourMemoriesAreBelong2iOS


What's this

A frequently asked question on

I'd like to test my app functions well in low memory conditions, but it's difficult to test. How can I induce low memory warnings that trigger the didReceiveMemoryWarning or applicationDidReceiveMemoryWarning: method in my ViewControllers or AppDelegate when the app is running on the real device, NOT the simulator? Or what are some ways I can test my app under these possible conditions?

The reason I can't use the simulator is my app uses Game Center and invites don't work on the simulator.

Okay, this tool simulates iOS on-device memory warnings like a hero.


  • It induces memory warnings through pressing the physical volume button on iOS devices

  • It works transparently. In other words, to use AllYourMemoriesAreBelong2iOS, you need just linking this framework into your app and hit the Run button to build and then run the Debug scheme. You will never be asked to configure anything and the debug codes in this framework will never be shipped in releasing version

  • It supports hot-swapability for KVOController from Facebook. In other words, if your app has linked KVOController.framework, the internal mechanism of AllYourMemoriesAreBelong2iOS would take advantage of it, otherwise the raw KVO API would be applied instead

How to use

  1. Clone and incorporate this repo into your project with git submodule:

    git submodule add ${YOUR_DIR} --recursive

  2. Hit File -> Add Files to "${YOUR_PROJECT_NAME}" item in Xcode menu bar, then choose the AllYourMemoriesAreBelong2iOS.xcodeproj

  3. Link AllYourMemoriesAreBelong2iOS in General panel

  4. Make sure build and run your project in Debug scheme. AllYourMemoriesAreBelong2iOS includes the invocation of Apple private API, its implementation was masked in releasing version as it will be rejected by Apple

  5. Press physical volume button on your iOS devices to induce the system memory warnings. You will want to process those notifications in didReceiveMemoryWarning or applicationDidReceiveMemoryWarning: method in the ViewControllers or AppDelegate


Torin Kwok.

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Creative Commons License
AllYourMemoriesAreBelong2iOS by Torin Kwok is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.