Question

How can I make my application display something only when they first launch the application for the first time. Example: They open up my app, an alert comes up, saying something like, “Do you want to play the tutorial?” Then, if they close the app, then re-open it, it won’t show up again.

Thanks

Answer 1

I’d recommend using NSUserDefaults:

- (void)openOneTime
{
    NSUserDefaults*        defaults = [NSUserDefaults standardUserDefaults];
    static const NSString* kKey = @"One Time Key";
    NSObject*              keyValue = [defaults  objectForKey:kKey];

    if (keyValue == nil)
    {
        [self doMyOneTimeThing]; // pop a dialog, etc...
    }

    // Adds an object for our key which will get found the next time around,
    // bypassing the above code block. The type and value of the object is
    // not important; what matters more is that an object exists for that
    // key at all.

    [defaults setBool:YES forKey:kKey];
}