I posted the source code I used at the bottom of this article. It should explain everything. Hope that answers your questions!

Thanks!
Mike

Thanks again!

So basically all that MainViewController does is just instantiate the Views, it’s up to you when you really create them, right?

About the MainWindow.xib. If i open that in IB it seems it doesn’t have a View but a Window(UIWindow) only. I see no default view to be honest.

Also in your example it seems that all the above ViewControllers still need to be added to the mainWindow (MainWIndow.xib). So you still depend on the MainWIndow.xib, this meaning that the MainWIndow is still the parent of all other ViewControllers.
But I assume this has to be the case if you create all your views at once? Instead of creating them as you go?

Let me use this as an example:
AppDelegate –> LoginView –> CreateCustomerView –> CustomerCreatedView

So AppDelegate knows only (and instantiates) LoginView, LoginView knows only (and instantiates) CreateCustomerView etc.
So only the parent view knows about it’s child view, and there is no ‘all-knowing’ app delegate. Is this also possible? and could this be a negative or positive way of designing your application?

Regards,
Vahid

You *can* instantiate all of your views at once if you want, depending upon your needs. However, this model allows you to be flexible. Just create methods to handle view instantiation and removal in your MainViewController and you can decide when views get created. For example, if you have a function in your MainViewController like removeLoginView: you can make that method remove the loginView and then instantiate a new view and then add that to your window’s view. In other words, when you call removeLoginView, only then will it create your next view, delaying the overhead of having many views in memory. But depending on your secondary view, you may want a longer application load time (by loading all your views at once in the beginning) than a delay after logging in (if you were to create the view after login, which might take some time). So really, it just depends on when loading that view makes sense for your particular case.

By default, your iPhone application will load the MainWindow.xib. There should be a default view in there if you open it in Interface Builder. If you want to add your own view programmatically, simply delete that view in IB and then call your [window addSubview:loginViewController.view] method you mentioned. Also make sure you have a [window makeKeyAndVisible]; method after adding the new view.

I hope that helps clear up my article for you. Let me know if anything else wasn’t clear and I’d be more than happy to elaborate.

Thanks!
Mike

Interesting article. Especially for someone like me, who just started learning to develop on the iPhone. Does this mean that you instantiate all your ViewControllers at once from within the MainViewController? Doesn’t that eat up a lot of memory?

At the moment I have started developing an application for the iPhone. The application has a LoginView (with its LoginVIewController). This ViewController is instantiated from the appDelegate (in the applicationDidFinishLaunching method).
So if login happens successfully, I will work from there and load the views as needed.

But somehow using “[window addSubview:loginViewController.view];” doesn’t load the LoginView and I keep seeing MainWIndow.xib. Any idea how that could be?

Regards,
Vahid

I have been using flash for a long time but have to tell you I think I would of make more money if I got paid for hours that I have lost trying to figure out why things don’t work then getting paid for developing websites what is probably very said. I think I should of take the php or java way in the begining.

Thanks for the tutorial you have comformed my worst fear IT IS BROKEN

I had a feeling that Petunia was the right dog for you, even if it is only as a foster. I am so glad that she has a great home before she gets a forever home. She was my favorite dog this summer that ended up at the shelter; I don’t know what I would have done had she not made it out of there bringing yet another dog into my home is not an option unfortunately). I hope that she finds the perfect forever home!