Question

I need to get the users sex when my application starts up.

How do I call the code only when the application first starts up? I just want to display an alert view with a simple “Are you Male or Female?” and then store the selection for use throughout the rest of the application. I don’t want the user to be asked every time they open the app, just the first time they open it.

Thanks,

Jack

EDIT

I know how to actually store the data, but where do I call the code so the alert view is only displayed when the application loads up?

Answer 1

Edit

You could place this so that is get’s called in

application:didFinishLaunchingWithOptions:

---

Sounds like a good use for NSUserDefaults. It depends how you want to store that information for example if I was to use a string (I’ve chosen string as detecting whether no value is already set is easier than using int) I could have something like this on start up

NSString * const PSUserSexKey = @"PSUserSexKey";

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

// If this returns nil then no value has been set yet
if (![userDefaults stringForKey:PSUserSexKey]) {
    //.. present dialog for picking sex
}

Then when a user has selected their sex you can save it with something like:

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

[userDefaults setObject:sex forKey:PSUserSexKey];
[userDefaults synchronize];