Re: Problem with NSUserDefaultsController
Re: Problem with NSUserDefaultsController
- Subject: Re: Problem with NSUserDefaultsController
- From: Mark Allan <email@hidden>
- Date: Mon, 1 Sep 2008 21:07:06 +0100
>> I've been playing around with bindings to NSUserDefaultsController in
a very simple app to test saving preferences, but the
[sharedUserDefaultsController save:self] method seems to return
immediately
without waiting for the save operation to complete.
The save does actually take place, which I can see if I open the
plist file
in Property List Editor, but if the very next line after sending the save
message is one which reads a property from the plist, it's the old value
which gets returned rather than the newly saved one.
The -save: method is unintuitive in name. It does not, as you may think,
save changes to disk. It simply commits any changes to the NSUserDefaults
object. It's a no-op if appliesImmediately is YES. The only way to force a
save is to call -synchronize on NSUserDefaults.
Thanks but the problem is actually the exact opposite. The file IS being
saved - it's the userdefaults object which doesn't contain the right value
unless there's some short delay between the save and objectForKey messages.
Sorry, I misread your post. We will need to see some code to determine the
issue.
Calling -synchronize on the userDefaults object makes no difference.
I'm already setting appliesimmediately to YES so that I can have
Cancel and OK buttons, and in terms of saving/reverting the plist file
it's working fine. Do I need to perform some action to connect the
userdefaults object to the userDefaultsController object?
Well, not other than binding it to the shared user defaults (unless you are
creating it programmatically, where it is set on creation). My understanding
is that the NSUserDefaults object is responsible for writing to disk, so if
you get the disk commit, it must be in the shared defaults.
Exactly! That's my understanding too, which is why I'm confused.
The complete Xcode project is available here:
http://idisk.mac.com/markallan-Public/TestingNSUserDefaultsController.zip
If anyone has time to cast an eye over it, I'd really appreciate it.
Thanks
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