NSUserDefaults: Dumping the structure of NSUserDefaults's standardUserDefaults

Question

Hi hi. Does anyone know of a quick way to dump the standardUserDefaults of NSUserDefaults via NSLog? This is what I have:

NSLog(@"NSUserDefaults dump: %@", [NSUserDefaults standardUserDefaults]);

But it returns:

NSUserDefaults dump: <NSUserDefaults: 0x50b520>

...which is not quite what I'm looking for. I'd really like to have key-value pairs.

Any help or a point in the right direction would be greatly appreciated. Cheers!

Answer 1

NSLog(@"NSUserDefaults dump: %@", [[NSUserDefaults standardUserDefaults] dictionaryRepresentation]);

Answer 2

Try:

NSLog(@"NSUserDefaults dump: %@", [[NSUserDefaults standardUserDefaults] dictionaryRepresentation]);

dictionaryRepresentation returns an NSDictionary representation of the defaults.

Answer 3

The shared NSUserDefaults is initialized with three search domains by default (you can add others too if you need to): app arguments, app preferences (what's stored in the app's plist), and localized system preferences. The last one is why you're seeing those unfamiliar Apple keys, but you don't really have to worry about "overwriting" them. If you use the same key name, it will just put that value in the app preferences domain. Your app's preferences is searched before the system preferences so you'll get the same value back, but it won't affect anything else.

If you really do want just your app's preferences though, you can remove the other search domains (the specific names you need is in the docs).

Answer 4

Thanks to Don McCaughey, my business partner and friend, for fixing up my code for me and supply a concise answer. To share it with the rest of you here is a code snippet:

  NSDictionary *bundleInfo = [[NSBundle mainBundle] infoDictionary];
  NSString *bundleId = [bundleInfo objectForKey: @"CFBundleIdentifier"];

  NSUserDefaults *appUserDefaults = [[NSUserDefaults alloc] init];
  NSLog(@"Start dumping userDefaults for %@", bundleId);
  NSLog(@"userDefaults dump: %@", [appUserDefaults persistentDomainForName: bundleId]);
  NSLog(@"Finished dumping userDefaults for %@", bundleId);
  [appUserDefaults release];

As you can see, everyone who was answering the question was on the right track, but no code offered up was the solution - until Don's editing of our code in source control. Thanks All!

Answer 5

NSLog(@"%@ defaults = %@", [self class], 
  [[NSUserDefaults standardUserDefaults] 
   persistentDomainForName:[[NSBundle mainBundle] bundleIdentifier]]);