For this use case you can also use the fact that classes are objects.
Something like the following:
Class theClass = nil;
if (.....)
theClass = [Class1 class];
else
theClass = [Class2 class];
id obj = [[theClass alloc] initWithFoo:.... bar:....];
Jesper Storm Bache
On Feb 10, 2010, at 12:07 PM, Jens Alfke wrote:
>
> On Feb 10, 2010, at 5:27 AM, Giannandrea Castaldi wrote:
>
>> I would like to alloc an object and defer the initialization to
>> another object, is a good practice? The reason is that I can alloc
>> several types of objects but the init method have the same signature.
>
> It's unusual, but I've done it once or twice. It looks like:
>
> id obj;
> if (.....)
> obj = [Class1 alloc];
> else
> obj = [Class2 alloc];
> obj = [obj initWithFoo:.... bar:....];
>
> It's important that you reassign 'obj' to the value of the init call, since
> initializers are allowed to return a different object than the receiver, and
> the class-cluster design pattern takes advantage of this.
>
> —Jens
>
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