On May 31, 2010, at 14:03, Richard Somers wrote:
> Apple's documentation seems to indicate that if you have an object in a nib
> with a managed object context outlet, that you can somehow set the outlet.
>
> The Core Data Programming Guide states "If you are setting the reference to
> the context in a nib file, make sure the appropriate outlet or binding is set
> correctly."
>
> http://developer.apple.com/mac/library/documentation/cocoa/conceptual/CoreData/Articles/cdTroubleshooting.html#//apple_ref/doc/uid/TP40002320-SW23
>
> How do you set a managed object context outlet in a nib file?
You can only do this if there's also a managed object context object in the
nib. A binding, of course, can reference a managed object context outside the
nib, via File's Owner or another proxy object.
> Suppose that I have a custom view with a managed object context outlet and I
> want to bind it or set it in the nib to the managed object context of the
> File's Owner which is a subclass of NSPersistantDoument. How would you do
> this?
You can set it yourself.
If you give the view an outlet to File's Owner, you can do it in the view's
awakeFromNib:
self.managedObjectContext =
self.windowControllerOutlet.document.managedObjectContext;
// or self.managedObjectContext = self.documentOutlet.managedObjectContext;
(if File's Owner isn't the window controller)
If you don't want to have the extra outlet, you can do it in the view's
didMoveToWindow:
self.managedObjectContext =
self.window.windowController.document.managedObjectContext;
// or self.managedObjectContext = self.window.delegate.managedObjectContext;
(if there isn't a window controller at all)
Of course, if you can do the above, you don't need the managedObjectContext
outlet at all -- the view can find the managed object context at any time
(after awakeFromNib or didMoveToWindow) using a key path reference like the
ones above.
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
