Today I wanted to add a menu item with a submenu similar to "Open
Recent". For example, Xcode has:
...
Open Recent File ->
Open Recent Document ->
...
For convenience, I copy/paste/duplicated the "Open Recent" menu item,
connected everything, wrote my code, but then found that my new menu
item was populated with recent documents and a "Clear Menu" item. In
other words, my code was ignored and instead it became another "Open
Recent" item.
I solved the problem by dragging a new menu item out of the Interface
Builder library and starting over from scratch, because I could not
figure out how Cocoa identifies the "Open Recent" menu item!
As far as I can see, the "Open Recent" menu item and its submenu are
not special in any way -- no tags, no targets, no actions, no
connections, no bindings, no special subclass. The "Clear Menu" item
of the submenu does have a connection to First Responder's -
clearRecentDocuments:, but removing that in my duplicate didn't change
the behavior.
Is there some magic under the covers? How does Cocoa know which menu
item is "Open Recent"?
Sincerely,
Jerry Krinock
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