What is the difference between addChildViewController and presentModelViewController
addchild, ios, presentmodalviewcontroller, pushviewcontroller, view
Solution
These are four totally different implementations
`addChildViewController` is used in iOS5 to do viewController containment, this will enable you to easily create your own `NavigationCotrollers` or `TabControllers` its only available in iOS5
`addSubview` is the lowest level of the three, this will just add a view to another view, as a child
`presentModalViewController` is used to present a viewController modally on the screen, hence overwriting the old one
`pushViewController` used in `UINavigationController` to push a new ViewController to the viewcontrollers stack,
Problem
I know there are three ways to change the view in iOS 1. ``` [self addChildViewController:thirdViewController]; [contentView addSubview:thirdViewController.view]; ``` 2. ``` First * sVC = [[First alloc] initWithNibName:@"First" bundle:[NSBundle mainBundle]]; [self presentModalViewController:sVC animated:YES]; ``` 3. ``` MyViewController *sampleViewController = [[[MyViewController alloc]initWithXXX] autorelease]; [self.navigationController pushViewController: sampleViewController animated:true]; ``` pushViewController requires the navigation controller, which I understand. However, when to use addChildViewController and presentModalViewController??