Re: Question about TableView - how do I know which tableView?
Re: Question about TableView - how do I know which tableView?
- Subject: Re: Question about TableView - how do I know which tableView?
- From: Scott Anguish <email@hidden>
- Date: Thu, 6 Feb 2003 02:45:19 -0500
On Thursday, February 6, 2003, at 02:31 AM, Denis Stanton wrote:
On Thursday, February 6, 2003, at 07:49 PM, Scott Anguish wrote:
One way to look at it, is that
you want the outlet of the object to be set to the UI element (so,
drag from the object that contains the outlet to the UI element)
So you always drag from the instances window to the UI when setting
outlets?
You can't really generalize it to being from the instances window,
since you will encounter situations where you needed to drag from one
user interface element to another to set an outlet.
I was worrying about whether the data was moving from the program to
the UI or from the UI to the program. I.e, I thought the direction of
the drag depended on whether it was Output or Input. This idea breaks
down with things like the table view, which is both input and output,
leaving my understanding a bit stranded
Yeah, understandable.
you want the UI element to trigger an action (so drag from the UI
element to the object that contains the action)
That I can follow. Clearly an action moves from the UI button to the
program action method.
Overall, I'd say that action/outlet and File's Owner are two of the
'newest' concepts to learn for Cocoa for most people. Memory
management (retain/release) is the other big stumbler for many folks.
I'll agree to all of that. I am totally bluffed by File's Owner.
O'Reilly's Learning Cocoa has very little to say about it, and so far
I can't see how to use it. What file it it referring to?
The file it is referring to is the nib. (simplest terms.. now, there
are some cases where a nib can be loaded multiple times with different
file owners.. this is how the Document architecture works for example).
The book says I specify FO programatically, in the second argument of
NSBundle's loadNibNamed: owner, which unfortunately means very little
to me at this stage as NSBundle has not been mentioned before in the
Cocoa book or the other tutorials I'm working through. I have had
another book or order since 14 December but apparently someone in the
Post Office borrowed it to read over Christmas and has forgotten to
put it back into the delivery system
Well, I'm biased. There is an explanation in Cocoa Programming
(pages 211-212).
Also, Apple's docs also cover it in the Resource Management ->
Loading Resources concept. Mind you, the info there is pretty sparse
at the moment. Someone should file an enhancement request at
bugreporter.apple.com
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