On Jul 1, 2008, at 7:16 PM, mmalc Crawford wrote:
On Jul 1, 2008, at 4:33 PM, Graham Cox wrote:
I also have a number of methods that allow "things" to be added
from arrays, or indexed by an index set. Is there a way to make
these KVC/KVO compliant or would they all
have to call through to one or more of these methods to ensure that?
<http://developer.apple.com/documentation/Cocoa/Conceptual/KeyValueObserving/Concepts/AutoVsManual.html#//apple_ref/doc/uid/20001844-178876
>
<http://homepage.mac.com/mmalc/CocoaExamples/controllers.html>
Batch modification of collections
Actually, a recent cocoa-dev thread alerted me to the documentation
hidden in the NSKeyValueCoding.h header. According to the method
descriptions in there, Tiger introduced several new indexed accessor
templates:
-<key>AtIndexes:
-insert<Key>:atIndexes:
-remove<Key>AtIndexes:
-replace<Key>AtIndexes:with<Key>:
which all correspond directly to NSArray/NSMutableArray methods.
So, Graham, you could use the following:
-objectsAtIndexes:
-insertObjects:atIndexes: // instead of your home-grown
addObjectsFromArray:atIndexes:
-removeObjectsAtIndexes: // You got this one square on. Ain't naming
conventions great!
-replaceObjectsAtIndexes:withObjects:
You should probably implement your removeObjectsInArray: in terms of -
[NSArray indexOfObjectIdenticalTo:] and removeObjectsAtIndexes:.
You probably already know this, but you don't _need_ to implement
_every_ such method for your property. For any given method in the
KVC protocol, there is some satisfactory subset that you can
implement. Once you've satisfied the requirements, implementing the
other methods may be nice for 1) optimization (as documented) or 2)
because they are convenient for your own code to call. Of course,
feel free to go whole-hog if you want, just know it's not strictly
necessary.
Cheers,
Ken
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