Re: Getting NSApplicationDelegate protocol
Re: Getting NSApplicationDelegate protocol
- Subject: Re: Getting NSApplicationDelegate protocol
- From: ecir hana <email@hidden>
- Date: Fri, 06 Jul 2012 11:35:18 +0200
Sorry I should've said that before: no, I'm on 10.6.
But thanks for the reply!
On Fri, Jul 6, 2012 at 11:14 AM, Stephen J. Butler <email@hidden
> wrote:
> On Fri, Jul 6, 2012 at 3:30 AM, ecir hana <email@hidden> wrote:
> > I'm trying to get the methods a protocol specifies and just stumbled upon
> > one problem: the following code returns NULL:
> >
> > Protocol *protocol = objc_getProtocol("NSApplicationDelegate");
>
> Are you trying this on 10.5? Or are you building this application with
> the 10.5 SDK?
>
> Before 10.6 the NSApplicationDelegate was an informal protocol (that
> is, a category of methods on NSObject). This is because "@optional"
> didn't appear till the 10.6 SDK/compiler and previous to that for
> protocols:
>
> 1) all methods were mandatory
> 2) you couldn't extend the protocol later; once you publish it's set
> of methods in a Framework you were fixed at that set
>
> Point (2) follows from point (1) if you think about it enough.
>
> So some of the protocols, like NSApplicationDelegate, weren't really
> protocols at all. But in 10.6 they introduced "@optional", and
> NSApplicationDelegate became a formal protocol.
>
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