What I would do use a class method and pass the two arrays as parameters.
On 1/12/11 2:03 PM, "cocoa-dev-requ...@lists.apple.com"
<cocoa-dev-requ...@lists.apple.com> wrote:
> Yes, you can, but... don't forget that in -computeVar3... self is not fully
> initialized. If you have all control on self it can be without problems, but
> Objective-C is an OO language. Consider this :
>
> - Your class is ClassA with it's init method.
> - Then you have ClassB, subclass of ClassA. ClassB override -init cleanly
> (call super in the beginning etc.)
> - Then ClassC, subclass of ClassB. ClassC override -computeVar3.
> And then the problems can begin, in -[ClassC computeVar3] self is not fully
> initialize from the point of view of ClassA, but the initialization has not
> even began from the point of view of ClassB and ClassC. I think it's a break
> of encapsulation principle.
>
> If you want to put the code outside -init only for code readability, just use
> a plain C function.
>
> Frédéric
>
> Le 12 janv. 2011 à 12:41, Luc Van Bogaert a écrit :
>
>> Hi,
>>
>> I have a question about how to design a initializer mehod.
>>
>> I have defined a class with three instance variables. Two of them are arrays
>> and their value can be initialized straightforward in the initializer method,
>> but the value of the third instance variable is the result of a complex
>> algorithm, based on the contents of the two arrays.
>>
>> I would like to implement that algorithm in a seperate method, instead of
>> writing it directly in the initializer. Is that OK, and could I then message
>> "self" in the initializer like:
>>
>> - (id) init
>> {
>> self = [super init];
>> if (self) {
>> var1 = ...;
>> var2 = ...;
>> var3 = [self computerVar3With:var1:var2];
>> }
>> return self;
>> }
>>
>> Or is it better to write the algorithm directly as part of the initializer?
>> Thanks,
>>
>> --
>> Luc Van Bogaert
>> luc.van.boga...@me.com
>>
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--
Gordon Apple
Ed4U
Little Rock, AR
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