I do have the indexed accessors implemented. I also have an accessor
that returns an array of the objects -- not sure why I did that...
force of habit from other accessors (having a setter -set<Key> and a
getter -<Key>). I certainly can understand one reason why this
wouldn't be good, because should some code somewhere acquire this
immutable array, and hang on to it, then that list of objects could
easily become out of sync.
That said, I "instrumented" my accessor and the index accessors to
see what is being used. Oddly (at least to me), if I do have the
array-returning-accessor implemented, it is actually invoked by Cocoa
code: -[NSBinder
_valueForKeyPath:ofObject:mode:raisesForNotApplicableKeys:] Perhaps
because the mutable array property is the content model for an
NSArrayController, which has its arrangedObjects bound to a Table View.
I'm curious why, if it is advised to not have the -<Key> accessor,
that Cocoa itself invokes the -<Key> accessor preferentially to the
index accessors?
On Jun 26, 2008, at 9:49 PM, Scott Anguish wrote:
the better way is to implement the indexed accessors described in
the KVC doc.
in fact I know at least one engineer would would like the doc to
specifically say that you should NOT have an accessor that returns
an array like this.
On Jun 26, 2008, at 7:54 PM, Stuart Malin wrote:
Separately, I have an accessor -attendees: of the Party class,
which is currently implemented as:
- (NSArray*) attendees
{
return [NSArray arrayWithArray:attendees]; // "attendees" is an
NSMutableArray, and is an ivar
}
I intentionally do not return the underlying mutable array,
because I don't want other code accessing the content without
going through the accessors.
Is my implementation reasonable? Or are there preferable ways to
do this (such as to return a copy of the mutable array)?
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