On May 20, 2008, at 9:41 AM, Johnny Lundy wrote:
QUESTION: How would you implement the binding to the model objects
"popUpArray" and "selectedGame" so that the popup loads from
"popUpArray" and its selection is kept in sync with the property
"selectedGame?" Specifically, is there a way to do it without
instantiating the object PopUp in the nib file?
I know how I have done it, and page 118 of Aaron's 3rd edition says
the same, but I want to hear if there is a "pure" MVC-compliant way
to do it.
If you want to bind your array controller to properties of Popup and
don't want to instantiate Popup in the nib, then create a path through
File Owner (or in the case of MainMenu.nib, the application delegate
object) to get the Popup object.
For example:
AppDelegate.h
@interface AppDelegate : NSObject {
Popup *popup;
}
@property (readonly) Popup *popup;
@end
AppDelegate.m
@implementation AppDelegate
@synthesize popup;
- (id) init
{
self = [super init];
if (self != nil) {
popup = [[Popup alloc] init];
}
return self;
}
@end
Change your Popup object to set-up your data in its init method,
rather than awakeFromNib (since it's no longer in a nib).
Then in your array controller, bind Content Array to the application
delegate with a model key path of "popup.popupArray". The same applies
to the array controller's selection (same as you would for Popup in
the nib, just bind to the application delegate with a model key path
starting with "popup".
The general point is to use a path through a controller to your model
object outside of the nib.
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