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

NSUserDefaults * removeUD = [NSUserDefaults standardUserDefaults];
[removeUD removeObjectForKey:@"shoping"];
[[NSUserDefaults standardUserDefaults]synchronize ];