How to erase an object saved with NSUserDefaults from disk

Let's say I saved data to disk like this:

[[NSUserDefaults standardUserDefaults] setObject:[N开发者_如何学编程SKeyedArchiver archivedDataWithRootObject:theArray] forKey:@"savedArray"];

How can I erase that from disk?

Try this.

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