Binding to a ShortcutRecorder hosted in a NSUserDefaultsController forces v2 compatibility mode

[nothes]

I was trying to set up a shortcut recorder in our application preferences in a subclass of NSUserDefaultsController, but not binding directly to anything user preference related, and hit the warning:

os_trace_error("#Error The control is bound to NSUserDefaults but is not transformed into an allowed CFPreferences value");
NSLog(@"WARNING: Shortcut Recroder 2 compatibility mode enabled. Getters of objectValue and NSValueBinding will return an instance of NSDictionary.");

in SRRecorderControl.m:977 of SR 3.4.0 (-propagateValue:forBinding:). The check seems overly broad -- in this case there was no userDefaults value being bound to convert to a CFPreferences value, and a v3 binding should be just fine. indeed, when I commented out the check, everything worked properly.

As a work-around I bound to a different class, but this seems like it shouldn't be required.

[Kentzo]

How come that your subclass of NSUserDefaultsController is not CFPreferences related? Please give me more context.

This check happens when the value is about to get propagated from SRRecorderControl to NSUserDefaults*. The latter can only handle Core Foundation and thus a transformer is required, hence the warning.

[nothes]

Sorry, badly worded, let me try again.

I have a class, GeneralPreferences, which is a subclass of NSUserDefaultsController. It has an associated xib, and an outlet to the shortcut recorder: @property (nonatomic) IBOutlet SRRecorderControl *quickEntryShortcutRecorder;

I attempted to bind it to an instance property SRShortcut *shortcut in my awakeFromNib, like so:

[_quickEntryShortcutRecorder bind:NSValueBinding toObject:self withKeyPath:OFValidateKeyPath(self, quickEntryShortcutValue) options:nil];

Nothing here should directly interact with an NSUserDefaults value, it should just update and read from my instance variable, and the fact that the variable is on a class that is an NSUserDefaultsDelegate seems irrelevant. I may be misunderstanding something, but I don't see what I could possibly transform in this instance to satisfy the requirement?

edit: thank you for your quick response, by the way!! :)

[Kentzo]

You need to pass a transformer via the options argument of the -bind:… method (from the example in README.md):

NSDictionary *options = @{NSValueTransformerNameBindingOption: NSKeyedUnarchiveFromDataTransformerName};
[_quickEntryShortcutRecorder bind:NSValueBinding toObject:self withKeyPath:OFValidateKeyPath(self, quickEntryShortcutValue) options:options];