On 19 Oct 2010, at 10:01 PM, Sandro Noël wrote:
> I am wondering if there is a way to ask the currently topmost windows
> controller to show a view...
> from a descendant of NSObject that has no clue of the view stack,
>
> if so, how do I get a reference to that view controller from that NSObject
> Descendant?
That an object — presumably a model object — should concern itself specifically
with what views a window is to display, is a huge breach of the
Model-View-Controller design pattern. You should consider a less accident-prone
design.
However, if you simply mean that you want the view _controller_ to know about
changes to the model, and adjust the views accordingly, you have three options:
- Make sure the model changes itself only in key-value-compliant ways, and have
the controller observe it.
- Have the model post NSNotifications at all interesting events, and have the
controller observe them.
- Code up a singleton "broker" object that can receive the notifications or KVO
events, or even specific method calls, from the model object, and then use its
knowledge of the window stack to get the frontmost window that has a controller
(maybe [NSApp {key,main}Window] suffices, or maybe it listens to
NSWindowDidBecome{Key,Main}Notification), and then try to send your intended
"show a view" message to its controller. Assuming you will never add a window
controller that doesn't implement that message.
I'm not going out of my way to make that sound fragile and hard-to-maintain.
— F
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