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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