从 Scene 切换到 ViewController
TestViewController *viewController = [[[TestViewController alloc] init] autorelease];
[[CCDirector sharedDirector].navigationController pushViewController:viewController animated:YES];
// 显示导航栏
[[CCDirector sharedDirector].navigationController setNavigationBarHidden:NO animated:NO];
从 ViewController 切换到 Scene
[[CCDirector sharedDirector]replaceScene:[HelloWorldLayer scene]];
[self.navigationController popViewControllerAnimated:YES];
// 隐藏导航栏
[[CCDirector sharedDirector].navigationController setNavigationBarHidden:YES animated:NO];