[Solved] Program crashing after trying to read a NSString

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The problem is probably that that _guideDescription string already is deallocated when you try to access it in -saveIntoExisted. You are now doing 

_guideDescription = [[NSString alloc] initWithString:[[notification userInfo] valueForKey:@"selected"]];

and that works, but I would recommend:

[_guideDescription retain];

That makes sure the system doesn’t deallocate the string.

solved Program crashing after trying to read a NSString