How to delete a user default value in NSUserDefaults?

Question

I.e., my app sets some standard default values at the beginning. Then those values may get overridden by the user. And when the user messes things up, I want to set those se

Answer 1

To remove a specific KEY value:

Swift 3+

UserDefaults.standard.removeObject(forKey: "KEY")

Obj-C

[[NSUserDefaults standardUserDefaults] removeObjectForKey:@"KEY"];
[[NSUserDefaults standardUserDefaults] synchronize];

---

If you need to reset UserDefaults/Clear All datas:

NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];

Swift 3:

if let bundle = Bundle.main.bundleIdentifier {
    UserDefaults.standard.removePersistentDomain(forName: bundle)
}

Answer 2

Try removeObjectForKey -- that should give you the ability to remove a preference.