How to reset saved data back to defaults?

Question

I'm implementing saved data on my app by using NSUserDefaults, like this:

[[NSUserDefaults standardUserDefaults] registerDefaults:[NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:0],@"mySetting",nil]];
// check
int firstLaunch = [[NSUserDefaults standardUserDefaults] integerForKey:@"mySetting"];
// set
[[NSUserDefaults standardUserDefaults] setInteger:1 forKey:@"mySetting"];

Now for development purposes, I'd like to be able to remove the saved data and go back to the defaults, without having to remove the app and re-install it each single time. Is there a quick way to do that? I thought resetStandardUserDefaults would do the job, but it doesn't.

Answer 1

The docs has this to say about resetStandardUserDefaults:

A subsequent invocation of standardUserDefaults creates a new shared user defaults object with the standard search list.

With some positive (wishful?) thinking it looks like that would be what you need. =)

Answer 2

For the key which you wish to revert to the default, -removeObjectForKey: will remove its definition from the app preferences. All things being equal, this means that subsequent invocations of -<type>ForKey: will return the registered default.

Answer 3

Have you tried reloading the defaults after calling reset? as PEZ says:

e.g

[NSUserDefaults resetStandardUserDefaults];
[NSUserDefaults standardUserDefaults];

This clears all the defaults and loads in the standard set.

If you only want to blitz one value as it seems from your snippet, then Graham's suggestion of -removeObjectForKey is easier.

EDIT: corrected my misuse of class methods.