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I'm working on an iPhone app and about to release version 2. We'll be changing the core data model and I'd like to simulate the upgrade process in the simulator before releasing it to users and potentially causing data loss for them. There doesn't seem to be any real good doucumentation on how to do this in a sandbox before releasing it.
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Q2: You can simulate an app update by publishing multiple versions in TestFlight and changing between them. Another method is to install the app on the device, and then open Settings => General => iPhone Storage. Select your app and press "Offload App".
Do one of the following: Choose Xcode > Open Developer Tool > Simulator. Control-click the Xcode icon in the Dock, and from the shortcut menu, choose Open Developer Tool > Simulator.
The process I've used in the past has been to wipe any working version from the Simulator, check out the previous version of my application from my repository, compile and install that, work with it for a bit, then compile and install the new version of the application. The installation of the new version should simulate the upgrade process, where you can test your data migration to your new model.
I also repeat this process on the device to make sure no problems are encountered there either.
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there are some cases that cannot be simulated in Xcode. Look at this Apple page: https://developer.apple.com/library/ios/technotes/tn2285/_index.html
You have to create IPA file and simulate update via iTunes.
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