ios - storing [NSNull null] values in NSUserDefaults, from JSON serialization, causes unwanted exceptions -

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I found the app where I use a JSON based API. As part of JSON, often values ​​are set to "blank". It can be normal: 

  {"data": ["one", "two", "three"] , "Name": blank, otherwise: 10}   
 Recently I tried to store a diverse NSDictionary hierarchy that was converted from the JSON object into NSUserDefaults. Unfortunately, this causes an exception if there is zero data, converting to [NSNull null] in iOS is evident that it can not be saved in priority  
 I was thinking that someone worked on it earlier is? I tried to add some arguments, which, with limited success, first remove all the empty values ​​from JSON, but it is inappropriate to modify the data before saving it. Do you have a better way of handling it?   
 
 
 You can first convert your NSDictionary into NSData, then store it safely in NSUserDefaults ( Because NSNull corresponds to NSCoding).    // archive NSDTA * data = [NSKEADArtic archivesDatabaseAssociation: dictionary]; [[NSUserDefaults standard standard defaults] setObject: For data: @ "key"]; // Unsource NSDTA * new data = [[NSUserDefaults standard user default] objectfore: @ "key"]; NSDictionary * newDict = [NSKeyedUnarchiver unarchiveObjectWithData: newData];   
 Edit: The original data object was being referenced instead of the new data object.

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