On Apr 27, 2009, at 11:09 PM, DairyKnight wrote:
I'm trying to understand how the KVC works in Objective-C. It
seems to
me that the 'set' method is not case-sensitive? For example, if I
define a
class with:
@interface TestClass : NSObject
{
int fido;
int Fido;
}
And have the following set methods:
-(void) setfido ...
-(void) setFido ...
Both by calling [self setValue: ... forKey:@"fido"] or [self
setValue:...
forKey:@"Fido"], the runtime would call the same 'setFido' method.
How could
this be?
Because KVC computes the name of the method to invoke by capitalizing
the property name. It's not completely insensitive to case, but the
first letter will be uppercased.
You should not have two properties which differ only in the case of
the first letter of their name. In general, property names should
start with a lowercase letter unless the first part of their name is
an acronym/initialism, like "URL".
In KVC documentation, you will often see placeholders <key> and <Key>
showing how method names are computed from keys. The case in those
two placeholders is important. The capitalized placeholder (<Key>) is
replaced with the capitalized form of the key name (e.g. "Fido" for
the key "fido").
Regards,
Ken
_______________________________________________
Cocoa-dev mailing list ([email protected])
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to [email protected]
