IPhone: infinite looping content inside a UIScrollView

Question

In my application, I create a custom picker that allows the user to select an element by scrolling it horizontally and touching it. I need the buttons inside this view to cycle indefinitely when the user scrolls in a certain direction. What would be the best way to handle this feature while maintaining the inertial scrolling of the UIScrollView when the content goes out of view?

From my research of others trying to do this, they have problems maintaining the slowdown animation if the scroll position is shifted programmatically in the middle of the scroll after the user lifts his finger. How can I get around this limitation?

An example of an application that currently has this feature is the Apple MobileMe Gallery application . In the interface, choosing a gallery, at the top, there is a horizontally scrolling photo processor that loops endlessly when it is dragged in one direction.

Any advice is appreciated.

Answer 1

Here is an example of code that does what you want :-)

Answer 2

I wrote a universal carousel control that easily handles this requirement and uses a simple data / delegate template to represent content representations:

http://charcoaldesign.co.uk/source/cocoa#icarousel

UIScrollView , , .