Re: subclassing NSArrayController
Re: subclassing NSArrayController
- Subject: Re: subclassing NSArrayController
- From: Allan Odgaard <email@hidden>
- Date: Wed, 3 Mar 2004 20:23:37 +0100
On 3. Mar 2004, at 19:08, mmalcolm crawford wrote:
[...] neither NSArrayController nor its two superclasses [...]
implements init:
This is misleading at best. Every class has a designated initialiser.
In the absence of other initialisation methods, it is init. Whether
or not NSObjectController or NSController implement init is irrelevant
to the issue.
The problem I think is, that initWithCoder is not really part of the
"designated initializer" convention.
If initWithCoder was the designated initializer, init in NSController
would have to call it, but that makes no sense, because it has no
decoder object to supply.
If on the other hand init was designated, then initWithCoder: would
have to call [self init], but then imagine we have a superclass
implementing initWithCoder and a subclass which does the same, the
subclass will call [super initWithCoder:aCoder], and the superclass
will then call the subclasses init method (and that will happen for
each superclass which implement the initWithCoder:).
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