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Editorial Team
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Asked: 2026-05-13T12:59:40+00:00

Whenever I build & run my program I notice that a new directory gets

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Whenever I build & run my program I notice that a new directory gets created in:
/Users/Username/Library/Application Support/iPhone Simulator/User/Applications

Therefore, there’s no way for me to persist core data between application builds. The way I thought to get around this issue (from a testing point of view) was to just use the iphone simulator to exit the application by pressing the circular menu button and re-run my app. I.e., not build it but just rerun it via the simulator to see if the data is persisted in core data.

Now I wanted to check if the data is persisting each time the application is run. The event that I’m using is:

  • (void)applicationDidFinishLaunching:(UIApplication *)application

But it only fires after I build & run the application but doesn’t get fired each time i restart the application – via iphone simulator (i.e., pressing menu button then rerunning my program).

Is there another event I should be using?? If I had an event that gets fired every time the application loaded I think I could just check to see if core data has data in it, if it doesn’t i just populate it with an xml file to initialize it, if it does have data I don’t do anything. Sound right? If so, what is that event called?

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1 Answer

  1. Editorial Team

    -applicationDidFinishLaunching: will be called EVERY time your app launches, whether from the debugger, hitting the icon in the Springboard (launcher), or either of these on the device.

    On the sim, a folder in the …/Applications directory is created for your app, and any data stored in there will be persisted. The actual name of the folder will change each time you build-and-run your app, but the contents will remain the same, so you can store data there.

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