Re: Leopard Properties and 'non-nil' declaration

FROM : Scott Anguish
DATE : Sun Jan 06 08:33:42 2008

that use of the term "property" I believe predates Objective-C 2.0 
Properties


I don't believe it is intended to imply Objective-C 2.0 Properties 
specifically.


On Jan 6, 2008, at 1:28 AM, André Pang wrote:

> On 06/01/2008, at 5:18 PM, Scott Stevenson wrote:
>

>>> Right now I'm resorting to writing my own setters for properties 
>>> that I want to be non-nil, which is OK, but hey, the less work I 
>>> have to do, the better :)

>>
>> Key-Value Validation may help:
>> <http://developer.apple.com/documentation/Cocoa/Conceptual/KeyValueCoding/Concepts/Validation.html

>> >
>
> I looked at that.  However, that documentation says that Key-Value 
> Validation methods are not called when a property is set:
>
>  "Key-value coding does not perform validation automatically. It is, 
> in general, your application’s responsibility to invoke the 
> validation methods"
>
> and:
>
>  "Warning: An implementation of -set<Key>: for a property should 
> never call the validation methods."
>
> It feels like Key-Value Validation is designed for higher-level 
> purposes than making sure an object is non-nil in a setter.  From 
> what I've read, it seems like the setter methods are the correct 
> place to check for that.
>
>
> --
> % Andre Pang : trust.in.love.to.save  <http://www.algorithm.com.au/>
>
>
>
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