两种方法删除NSUserDefaults所有记录

//方法一

NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];

[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];

 

//方法二

- (void)resetDefaults {

    NSUserDefaults * defs = [NSUserDefaults standardUserDefaults];

    NSDictionary * dict = [defs dictionaryRepresentation];

    for (id key in dict) {

        [defs removeObjectForKey:key];

    }

    [defs synchronize];

}