MVC....brief question
Hi all,
I have just completed my first little cocoa app.
Please, one brief question.
The app follows ( or tries to) the MVC model, using bindings. ( A
view, a single NSObjectController, and a model)
I also used the method
+ (NSSet *)keyPathsForValuesAffectingBmi /* bmi is model Ivar */
{
return [ NSSet setWithObjects:@weight, @height, nil];
}
My question. I included the above method in the model, as this is the
only place available. I just wonder if this is correct? (in a sense
it enables the getter bmi. )
Apologies if this has previously been asked, or if there is a ref to
this...I was not able to find it, but will gladly look if there is one.
Thanks in advance.
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Re: MVC....brief question
On Jul 7, 2009, at 6:31 AM, Michael de Haan wrote:
+ (NSSet *)keyPathsForValuesAffectingBmi /* bmi is model Ivar */
{
return [ NSSet setWithObjects:@weight, @height, nil];
}
My question. I included the above method in the model, as this is
the only place available. I just wonder if this is correct?
The only appropriate location for the method is the object that has
all of the referenced properties.
(in a sense it enables the getter bmi. )
Not in any sense, really. It simply tells all observers of bmi that
bmi has changed every time weight or height changes.
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: MVC....brief question
On Jul 7, 2009, at 7:16 AM, Keary Suska wrote:
On Jul 7, 2009, at 6:31 AM, Michael de Haan wrote:
+ (NSSet *)keyPathsForValuesAffectingBmi /* bmi is model Ivar */
{
return [ NSSet setWithObjects:@weight, @height, nil];
}
My question. I included the above method in the model, as this is
the only place available. I just wonder if this is correct?
The only appropriate location for the method is the object that has
all of the referenced properties.
Of course! :-)
(in a sense it enables the getter bmi. )
Not in any sense, really. It simply tells all observers of bmi
that bmi has changed every time weight or height changes.
Beginning to really appreciated the beauty of cocoa...but it's a
steep learning curve!!
Thanks again for clarifying.
Michael.
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