How to show an UIAlertView (Or UIView) at the first launch of an Application?

I would like to know how to show an UIAlertView or a UIView ONLY at the first launch of my application.



Use NSUserDefaults to store a BOOL, like so:

-(void) showFirstRunAlerts {

    BOOL ranBefore = [[NSUserDefaults standardUserDefaults] boolForKey:@"RanBefore"];

    if (!ranBefore) {
        UIAlertView *alert = [[UIAlertView alloc]
                          initWithTitle:@"Message title."
                          message:@"Your message."
        [alert show];
        [alert release];

        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"RanBefore"];
        [[NSUserDefaults standardUserDefaults] synchronize];

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