iOS gist for doing something only the first time an app is run

gistfile1.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // Get a reference to the user defaults database
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    
    // If this is the first run we're going into this if statement
    if(![defaults objectForKey:@"firstRun"])           
    {
        NSLog(@"This is the first run!!!!");
        
        // Set this and use later to determine what to do on first run
        isFirstRun = TRUE;
        
        // Persist the first run var so the next time we don't enter this if statement
        [defaults setObject:[NSDate date] forKey:@"firstRun"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }
    
}