Trouble with NSUserDefaults extension class
Trouble with NSUserDefaults extension class
- Subject: Trouble with NSUserDefaults extension class
- From: Bryan Hansen <email@hidden>
- Date: Thu, 31 May 2007 10:42:08 -0700
I am trying to create an extension class for NSUserDefaults so that I
can more easily store preference settings for a custom domain. I have
created my class with 3 methods:
// NSUserDefaults+MyExtensions.h
#import <Cocoa/Cocoa.h>
@interface NSUserDefaults (MyExtensions)
- (id)objectForKey:(NSString *)key forPersistentDomain:(NSString *)
domain;
- (void)setObject:(id)anObject forKey:(NSString *)key
forPersistentDomain:(NSString *)domain;
- (void)removeObjectForKey:(NSString *)key forPersistentDomain:
(NSString *)domain;
@end
and then I have about 4 lines in each method that get, set and remove
a key in whatever domain they pass in. The trouble is that I crash at
runtime with the following error:
Main Thread Exception in Aperture: *** -[NSUserDefaults
objectForKey:forPersistentDomain:]: selector not recognized [self =
0x110bf70]
when I use the [NSUserDefaults standardUserDefaults] object. If I
init my own NSUserDefaults object it will pick up the my extensions,
but I believe I should be using the [NSUserDefaults
standardUserDefaults] for things to behave correctly.
Is there any reason why extensions are not working with the singleton
instance, standardUserDefaults? Or is there a way to use my own
init'ed NSUserDefaults object which won't differ from the
standardUserDefaults?
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