This just happened to me... I can't figure out how to get it back. All i did was press command+T and it disappeared. Can you explain what "issuing a defaults delete com.apple.dt.Xcode" command is?
keelay
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This fixed it for me. When apple logo appears, press volume up, then volume down, then press and hold the side button. When I did this it made me plug in my phone to my computer and update the phone. This puts the phone into recovery mode.
These videos were helpful for me:
Random youtuber - youtube.com/watch?v=C5VWYbIH49s
OR
Apple Support - youtube.com/watch?v=2CRilTPouRU
@mtsrodrigues is there any more documentation on this? I don't quit understand all of what's going on in your example. Where is it defining the CoreData store? How do you save after certain actions?