Clearing NSUserDefaults

Question

I'm using +[NSUserDefaults standardUserDefaults] to store application settings. This consists of roughly a dozen string values. Is it possible to delete these values permanently instead of just setting them to a default value?

Answer 1

Did you try using -removeObjectForKey?

 [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"defunctPreference"];

Answer 2

This code resets the defaults to the registration domain:

[[NSUserDefaults standardUserDefaults] setPersistentDomain:[NSDictionary dictionary] forName:[[NSBundle mainBundle] bundleIdentifier]];

In other words, it removeObjectForKey for every single key you ever registered in that app.

Credits to Ken Thomases on this Apple Developer Forums thread.