John Stoneham <mailto:captnjamesk...@gmail.com> wrote (Monday,
May 3, 2010 6:59 AM -0500):
Here's the scenario. In my (OS X) app's preferences, I'd like the user to be
able select between sets of preference settings, and I'd like to be able to
use NSUserDefaults for this without having to deal with extra plists.
Here's an example to illustrate the idea. On the preferences page there is a
combo box, where the user can pick a "theme" or enter the name of a new
theme. The settings for the theme are some check buttons which have
different states for the different themes. Obviously, the current state is
easy with NSUserDefaults. But I can't figure out how to have each "theme"
state stored in NSUserDefaults.
I think what you're trying to do is create a set of nested pref
values that can get swapped out, while accessing the current set
using bindings.
The approach I'd take is to organize all of the theme-related
settings into a single dictionary. You can then store one
dictionary in NSUserDefaults as the current or active theme set
(i.e. "ActiveTheme"). Now set all of your bindings to reference
the values in that dictionary (i.e. button.value = ActiveTheme.someSetting).
Now, create an array or another dictionary where you can store
all of the themes that aren't active (i.e. "InactiveThemes").
When the user choose a theme, insert the active theme into the
inactive collection and replace the active theme dictionary with
the chosen one. Writing both back to the NSUserDefaults should
notify any observers that the values along those key-value-paths
have changed.
--
James Bucanek
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