What happens when Null is set to NSString ??

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What Happens when Null is set to NSString? and saved in NSUserDefaults?? Will it crash since it treats it like a deallocated instance??


You are mixing metaphors. First, sprinkle around some NSLog messages reporting on the object type, before saving then on retrieval (NSStringFromClass[obj class]). You did not make it clear if you are using a C based SQLite interface or Core Data with a SQLite backing store, so update your question.

Lastly, if you message an object of class A with messages that only class B responds to, you will get exceptions pointing that error out. A dealloced error is totally different, and indicates your memory management is faulty. To track down the latter error, enable Zombies and break on any message send to one (many Q&As on how to do that here).