I have a CoreData app, and I don't want the user to be able to undo
almost all actions.
Without knowing the specifics of your situation, I'd suggest that you
don't do this. Having pervasive undo is generally going to lead to a
better user experience.
So, during my -applicationDidFinishLaunching method, I
disableUndoRegistration on my managedObjectContext.
Now, I want to add undo/redo in a couple specific situations.
During one method, I am calling this:
NSUndoManager *undoManager = [[self managedObjectContext]
undoManager];
[undoManager enableUndoRegistration];
[[undoManager prepareWithInvocationTarget:self]
addObjects:validRemovals toCollection:collection];
(If I am not isUndoing, I call -setActionName: here with some
appropriate text)
[undoManager disableUndoRegistration];
And during the -addObjects method, I am calling the compliment:
NSUndoManager *undoManager = [[self managedObjectContext]
undoManager];
[undoManager enableUndoRegistration];
[[undoManager prepareWithInvocationTarget:self]
removeObjects:validAdditions fromCollection:collection];
(If I am not isUndoing, I call -setActionName: here with some
appropriate text)
[undoManager disableUndoRegistration];
However, my "Undo" menu item never becomes enabled. Am I being too
picky about when I am enabling and disabling registration? (I
briefly tried leaving undo registration turned on throughout the
application, but the Undo menu item still never became available.)
There may be two problems here.
Does the window's delegate return an undo manager (the one for the
managed object context) when asked?
Also, you probably don't want to be manually registering undo actions
for CoreData operations. CoreData already manages undo, so let it.
Normally it will process the pending changes at the end of the
current iteration of the event loop. If you have special needs, you
can trigger this manually by sending -processPendingChanges to the MOC.
Jim
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