Question

I am pulling in a list of coordinates from our web server. I’m storing the whole list as an NSDictionary. While I am using the data (lat, long, radius, name) I would like to update the list of data with 1 or 2 more fields. Is there a way to insert these 2 items to the existing dictionary?

My only existing thought is that I would have to load the data into an NSMutableDictionary to allow additions and just create the new dictionary and overwrite the existing one with the new updated data. Hoping for a simpler or cleaner way rather than ghetto rigging it. Thanks in advance.

Answer 1

Your thought is correct, you have to create an NSMutableDictionary, as the NSDictionary can not be modified.

NSMutableDictionary *newDoc = [[NSMutableDictionary alloc] initWithDictionary:doc];

If you have any immutable arrays or dictionaries in the NSDictionary, you might need a deep copy for modifcations.

NSMutableDictionary *newDoc = (NSMutableDictionary *)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, doc, kCFPropertyListMutableContainers);