objective c - A good way to serialize changes in object graphs using NSCoding? -


i have graph of objects support nscoding. , have separate class takes care of serialization itself, ie. detects changes in object graph , uses nskeyedarchiver save file.

i’m happy design, i’m not sure how watch changes in object graph. 1 general solution thought of add version property each object gets incremented each change:

- (void) setfoo: (id) newfoo {     _foo = newfoo;     self.version++; }

when object in graph references other objects, observes version (using kvo) , if changes, change propagated upwards. serialization class observes version of root node.

this works, managing kvo stuff cumbersome , prone errors. can think of a better solution? 1 further constraint objects know little serialization possible. should know how serialize (by implementing nscoding), shouldn’t care more.

this has common problem in serialization frameworks, right?


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