如何在更新的应用程序上清除NSUserDefaults

Question

I am using HockeyApp and Ship.io to deploy my ios app to multiple testers on every build. In my latest build, I changed the data types of some objects i was saving into NSUserDefaults, and now it crashes because old data stored on everyones local device clashes with this change. This crash disappears when a person deletes the app and reinstalls from scratch (bc userdefaults get cleared)

I want some kind of clearing logic so that NSUserDefaults get cleared out when people update to latest version. How can I do this?

Answer 1

I would check if an old key exists and if it does reset the defaults using:

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

(Typed on mobile so sorry if the formatting sucks)

Answer 2

what about something like this?

-(void)removeNSUserDefaults {


    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    [defaults removeObjectForKey:@“yourkey1”];
    [defaults removeObjectForKey:@“yourkey2”];
    //do this for all your keys..
    [defaults synchronize];

}

just remove the objects from the dictionary