Building custom view controllers based on the UIScrollViewController for the iPad

I've been eying the E*TRADE iPad app (visible at http://www.apple.com/ipad/apps-for-ipad/#etrade) and wondering just how they manage to effect a 'carousel of view controlle开发者_StackOverflow中文版rs'. Clearly there's a UIViewController under the covers ... but beyond that I get quite lost.

It's pretty much a UITableView on it's side.

Is there any sample code or projects out there that someone can point me at?

Your clues & other hints are most welcome

M.

It looks like that app is done with two (upper and lower) paging UIScrollViewControllers that hold the different views.

How this works is by creating a scrollView, enabling paging and setting the contentSize to an appropriate value (i.e. width of a view * number of views + (View Padding * number of views))

Here is a classic config for a UIScrollView to enable paging:

scrollView.pagingEnabled = YES;
    scrollView.contentSize = CGSizeMake(x,y);
    scrollView.showsHorizontalScrollIndicator = NO;
    scrollView.showsVerticalScrollIndicator = NO;
    scrollView.scrollsToTop = NO;
    scrollView.delegate = self;

Here is some documentation.

I seems pretty doable, it is surely a Model-View-Controller all the way through.

They have one viewController that sits at the very top of the hierarchy. To this controller they add a number of other viewControllers views, a ScrollViewController, LittleStockViewController etc. etc. All the viewControllers get their data from a model that is being kept up to date with data, i.e. when you change selection in LittleStockViewer the model changes and all views update. I don't think it differs much in architecture from, say, an image viewer.

Try looking into the composite pattern, thats the way I would go on this one, implementing something like an - (void) update; method and a common interface/protocol for all the children to adhere to.

Best of luck with it:)