问题
I don't know what it is but it happens when is fetching elements, well that's what I asume because the app just freezes, I pause the debugging and the debugger stops at a return [__context executeFetchRequest:request error:&error]; Any help about this will be very appreciated.
回答1:
Check this post basically you'll need to lock your persistentStoreCordinator because read only calls aren't thread safe. Apple documentation mention this here. Cheers my friend!
来源：https://stackoverflow.com/questions/8002906/executefetchrequesterror-freezes-app