Re: Using NSSortDescriptor to reverse sort an NSArray containing NSString objects
Re: Using NSSortDescriptor to reverse sort an NSArray containing NSString objects
- Subject: Re: Using NSSortDescriptor to reverse sort an NSArray containing NSString objects
- From: Ken Thomases <email@hidden>
- Date: Fri, 6 Jun 2008 16:51:45 -0500
On Jun 6, 2008, at 4:16 PM, Adam R. Maxwell wrote:
On Friday, June 06, 2008, at 02:07PM, "George Stuart" <email@hidden
> wrote:
The suggestion of using a keyPath of @"self" presents another
question:
1) I assume NSSortDescriptor is using valueForKeyPath:, which in
turns calls valueForKey: some number of times, to get the object for
the keyPath I specified. Is it defined behavior that sending an
object valueForKey:@"self" will return the object itself?
I always use self as the key path in cases like this, since -
[NSObject self] is documented to return the receiver.
And, to complete the picture, the documentation for valueForKey:
describes how that method obtains the value for the key. The first
step in its search for key @"self" would be to look for the method
named "self".
It has the advantage of working with objects other than strings.
Well, so does -description. ;) It just gives a different thing. That
is, -self always returns the receiver, while -description only returns
the receiver for an NSString, but always returns something (a string)
that may be useful for a given purpose (possibly even sorting).
Cheers,
Ken
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