I’ve just noticed a glitch where my custom file preview box in an NSOpenPanel
works fine on OS X 10.9.5 but does not get updated on 10.8.5. Specifically, I
declare a dependency of my property on panel.filenames, panel.URL and
panel.directoryURL (just to see if ANY of them fire), and none of them are
getting prodded when the user changes the selected file/directory. Does anybody
know if this is expected behaviour?
I did notice somewhere buried in here:
https://developer.apple.com/library/mac/releasenotes/AppKit/RN-AppKitOlderNotes/#X10_9Notes
that it says (for OS X 10.9)
Key Value Observation compliance was dramatically increased for public and
some private properties of actual, non sandboxed NSOpen and Save panels,
including keys affecting other values. For example, if the directory value
changes on a save panel, this will cause a KVO notification to be emitted for
the URL value as well as the directory value. Sandboxed NSOpen and Save
Panels do not have the same level of KVO compliance.
This does make me wonder if I should perhaps not be surprised that my use of
keyPathsAffectingValueForKey is not going well, although nothing in that
statement seems to specifically preclude what I am doing from working on 10.8.
Does anyone know if there’s any hope of my KVO approach working? The
alternative seems to be to implement a delegate method for
panelSelectionDidChange. Would that be the sensible way to deal with this, or
is there a third and better way I should be using?
Cheers
Jonny
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