I've just used an NSCollectionView for the first time, following the
instructions in "Quick Start for Collection Views". The array controller's
content is an array of Foo managed objects, which have a relationship to Bar
managed objects. When I got down to the subviews, I wanted a popup menu. So I
put in an NSPopUpButton and bound it thus:
PopUp Button Bindings
Content:
Bind to: File's Owner (Document's window controller)
Model Key Path: document.availableBarChoices
Content Values:
Bind to: File's Owner (Document's window controller)
Model Key Path: document.availableBarChoices.displayName
Selected Object:
Bind to: Collection View Item
Model Key Path: representedObject.barChoice
BarChoice is a thin wrapper class around Bar, which adds capabilities of
creating a new Bar from an external source.
Everything works fine, except that when the popup menu is displayed, each
barChoice in the menu gets an -encodeWithCoder: message. This occurs whether
the array controller is in Entity or Class mode, and regardless of whether or
not barChoice is listed as one of its keys.
At first, I did not have -encodeWithCoder: implemented, because there is no
known need for it. So I implemented -[BarChoice encodeWithCoder:] -- as a
no-op -- and that satisfied it!
I've also implemented this with NSPopUpButtonCells in the column of a table
view and that implementation does not have this problem.
Why might the collection view feel it needs to encode the items in this popup
menu?
Jerry
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