I have a NSPopUpButton that is driven by bindings. I establish
(programmatically) a binding between the NSPopUpButtom instance's
"selectedTag" property and an NSTreeController that contains objects
that have a property that should correspond with the available tag
values. This does not seem to work. It appears that the binding is
instead working with the popup button's index value. Symptoms and
circumstance:
1) I changed the binding for the popup button's contentValues to refer
to the tag property of the bound collection (rather than the title),
and sure enough the proper tag values are displayed, so the menu items
do have tag values.
2) When I change the popup button selection, the value in the object
bound to the "selectedTag" is changed -- problem is: the value that is
set is the index value, not the tag value.
The code...
First, what works: I drive the content and contentValues from an
object that I construct which is an indexed accessor KVC (read-only)
compliant with a backing store array of NSMenuItem items. When I
initialize the collection, the menu items are initialized with a
title. I also set the tag property. The bindings for these to the
NSPopUpButton instance is done programmatically:
[twitterUpdateFrequencyPopupButton bind:@"content"
toObject:updateItems
withKeyPath:@"UpdateFrequencyMenuItems"
options:nil];
[twitterUpdateFrequencyPopupButton bind:@"contentValues"
toObject:updateItems
withKeyPath:@"UpdateFrequencyMenuItems.tag"
options:nil];
"updateItems" is the ordered collection of NSMenuItems; its indexed
accessor property is "UpdateFrequencyMenuItems"
Here's what doesn't work, the binding for the selected tag value:
[twitterUpdateFrequencyPopupButton bind:@"selectedTag"
toObject:twitterAccountsArrayController
withKeyPath:@"selection.frequency"
options:nil];
"twitterAccountsArrayController" is an NSArrayController. The objects
it manages have a "frequency" property.
When this is run, I receive no messages in the console about anything
bad or wrong.
I've tried searching the usual places and with Marc Liyange's Mac
Developer Search Engine for matters related to NSPopUpButton and
selectedTag, but haven't found anything germane. So I post here.
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