The problem I had was that I needed to use -[NSUnarchiver
decodeClassName:asClassName:] for unarchiving a file previously
encoded using the convenience method. Certainly it's possible to
use the class method +[NSUnarchiver decodeClassName:asClassName:],
but it seems silly to pollute the global archiver class table for
a single file.
You can set a delegate on the unarchiver and use:
- (Class) unarchiver:(NSKeyedUnarchiver*) unarchiver
cannotDecodeObjectOfClassName:(NSString*) name originalClasses:
(NSArray*) classNames;
to avoid this problem. (If I've understood it properly)
That actually would not have helped, because it's an instance method.
The whole problem to begin with was that there wasn't any clear way
for a manually constructed instance of NSKeyedUnarchiver to decode a
file previously saved using the convenience method.
But really, I've no problem here to solve. The file is long gone. I
just remember going through the docs at the time and throwing my
hands up in frustration that they didn't mention the "root object
key" used by the convenience method. I tried "Root" as the key and
the plain "decodeObject" method, but neither worked. Thanks to
Patrick I now know the key is "root", which I should have tried, but
ought to be documented.
~Martin
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