Re: File's Owner
Re: File's Owner
- Subject: Re: File's Owner
- From: Ken Thomases <email@hidden>
- Date: Sun, 25 May 2008 03:17:09 -0500
On May 25, 2008, at 2:15 AM, Johnny Lundy wrote:
And, if I don't understand something, I will ask why. This is not
magic - there is actual computer code behind that File's Owner
concept, and it is deterministic, not vague, not abstract, not a
philosophical enigma, not random, not ambiguous. If I had the source
code I could see what it does.
But your most recent emails explain that you already understand _what_
it does, and you were only confused about the why! Looking at the
source code wouldn't help with the why.
As I attempted to explain, you will come to understand the why with
experience. Since you seem vexed about not understanding it now, I
suggested that you take a look at some of the sample code which uses
File's Owner in non-trivial ways. I also provided a quickie
conceptual example of an application which presents one model in two
views.
Another quickie conceptual example: the classic document-based
application architecture. In that architecture, you often re-use a
single nib, loading it repeatedly. That nib describes the interface
for a single document. But the application can open multiple
documents. That is, it has multiple models. Note that in this case,
the model can't live in the nib -- it's coming from a document file
somewhere. Each time the application loads the nib for a document's
interface, the new objects from that nib have to connect up to a
different model/document. They do this through the File's Owner,
which is a different object for each loading of the nib.
-Ken
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