On 10 Nov 2010, at 14:05, Quincey Morris wrote:
> On Nov 10, 2010, at 05:58, jonat...@mugginsoft.com wrote:
>
>> On 10 Nov 2010, at 12:47, Remco Poelstra wrote:
>>
>>> Hi,
>>>
>>> I've an object which properties I access via key-value coding. These
>>> properties are sometimes "uninitialized" (that means, the real value needs
>>> to be read from the Wifi network). I would like to detect a read of such
>>> property and then fetch it from the network. It's not a problem that in the
>>> mean time a "wrong" value is returned. How can I detect a read of a
>>> property?
>>>
>>> Kind regards,
>>>
>>> Remco Poelstra
>>>
>>>
>>
>> Try overriding your objects -valueForKey: and -valueForKeyPath:
>> NSKeyValueCoding is implemented as a category on NSObject so will be
>> available on your object.
>
> Unless I'm missing something, that isn't necessary. The OP just needs to
> write a getter for the property.
>
> For a property "abc", he'd do something like this:
>
> // @synthesize abc; (don't need this any more)
>
> - (NSString*) abc {
> if (... we already fetched the value from the network ...)
> return ... the correct value ...
> else {
> ... start the network access ...
> return ... a temporary value ...
> }
> }
>
> That works even if the value is accessed via [... valueForKey: @"abc"],
> because the default implementation in NSObject will call the getter 'abc' if
> it exists.
I was just thinking that the overrides would provide a convenient point to
process all requests for undefined properties.
Depends on the design and requirements of the model I suppose.
Regards
Jonathan Mitchell
Developer
Mugginsoft LLP
http://www.mugginsoft.com
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