Re: Cocoa Bindings - nondebuggable, non-obvious, procedural ???
Re: Cocoa Bindings - nondebuggable, non-obvious, procedural ???
- Subject: Re: Cocoa Bindings - nondebuggable, non-obvious, procedural ???
- From: Tim Lucas <email@hidden>
- Date: Tue, 4 Jan 2005 10:35:03 +1100
On 04/01/2005, at 8:24 AM, Izidor Jerebic wrote:
The problem arises when the add: method is already implemented and is
quite well behaving for purposes of addition (encapsulation), but is
not the one Tim suggested. There is no need for the add: method to be
like the one above. It might do any sorts of things internally. And it
is quite correct to be able to do it, because these things are
internal to the object, and can be implemented independently of the
environment.
And, besides that, with bindings you need to spend extra effort,
because there are more demands on your code - one is the basic model
behaviour, and the second is bindings (KVO/KVC).
Jeeez extra effort?! What were Apple thinking when they gave us
bindings? We may have to do something ourselves, or *gasp* change some
code?
Your decision is: a bit of extra code in the model or a lot of extra
code in the controller.
Its a hell of a lot easier testing your model for correctness than
testing your bloated controller.
I am not trying to put down the idea of bindings. I am using
willChange/didChange internally in all my apps (kind of homegrown
KVC/KVO). I just cannot see the benefits of Cocoa implementation being
used in general application with complex object model (meaning complex
behaviour), compared with the costs...
Yep bindings may not be the best if you have a complex object model
(such as an app that puts almost all of the responsibility within the
model objects themselves). Bindings best suits applications built using
the MVC design pattern, where the complexity usually lies within the
controller layer.
Don't forgot that bindings are a great general purpose tool for keeping
data between objects in sync and valid -- not just for UI.
- tim lucas
http://www.toolmantim.com
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| References: | |
| | >Cocoa Bindings - nondebuggable, non-obvious, procedural ??? (From: Izidor Jerebic <email@hidden>) |
| | >Re: Cocoa Bindings - nondebuggable, non-obvious, procedural ??? (From: Tim Lucas <email@hidden>) |
| | >Re: Cocoa Bindings - nondebuggable, non-obvious, procedural ??? (From: Izidor Jerebic <email@hidden>) |
| | >Re: Cocoa Bindings - nondebuggable, non-obvious, procedural ??? (From: mmalcolm crawford <email@hidden>) |
| | >Re: Cocoa Bindings - nondebuggable, non-obvious, procedural ??? (From: Izidor Jerebic <email@hidden>) |