Core Data does a really good job at what you are describing, when
using SQLite as a persistent store, although this may not be what are
you looking for.
The only other approach to this that I think of is to cache the
objects that change in your model and then only store these objects
either directly or by tweaking the NSCoding protocol methods in your
model, but then your code will have to be clever enough to know what
files or parts will have to retrieve if a revert operation is
requested. However, it looks to me too complicated or worthless to
follow that route.
If storing your model is really a performance issue, then you might
consider going to Core Data and SQLite stores.
Joan Lluch
El 07/07/2008, a las 16:13, Randy Canegaly escribió:
I have an application whose data model is an NSMutableArray with
elements that could be pointers other NSMutableArrays, much like
what you would navigate with a NSIndexPath. I am using
NSKeyedArchiver to archive the data model to a file. Right now I
archive the entire top level array object (and therefore all its
parts) to the file using archiveRootObject:toFile.
Is it possible to archive only the portion of the data model that
changed rather than the entire thing every time? I need the entire
data model to be archived so that it can be reloaded when the
application starts but for performance reasons I am interested in
seeing if it's possible upon a change to the data to only re-archive
the small part that changed.
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