gistfile1.m

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"user"]) {
        // Type casts? I thought we were using a static language here?!
        UserViewController *userViewController = (UserViewController *)segue.destinationViewController;
        // I have to expose a property in order to configure the view controller.
        // The view controller is in an invalid state prior to this assignment.
        userViewController.user = self.selectedUser;
        [self.navigationController pushViewController:userViewController animated:YES];
    } else if ([segue.identifier isEqualToString:@"settings"]) {
        // More of the same boilerplate...
        SettingsViewController *settingsViewController = (SettingsViewController *)segue.destinationViewController;
        settingsViewController.user = self.selectedUser;
        settingsViewController.editable = self.loggedIn;
        [self.navigationController presentViewController:settingsViewController animated:YES completion:nil];
    }
}