Switch Navigation Stack (Useful for Login)

NavigationStackSwitch.m

- (void)replaceNavigationStack
{
	FirstViewController *vc1 = [[FirstViewController alloc] init];
	SecondViewController *vc2 = [[SecondViewController alloc] init];
	ThirdViewControler *vc3 = [[ThirdViewController alloc] init];
	NSArray *newViewControllers = [[NSArray alloc] initWithObjects:vc1, vc2, vc3, nil];
	[[self navigationController] pushViewContrller:vc3 animated:YES];
	[[self navigationController] setViewControllers:newViewControllers];
}